No mister, it is not misleading, especially since you do not seem to have an idea what era the OPer was thinking of. Not unless you are an oracle?!
I actually watched the video. Did you? It is clearly not focused on the 19th century, which is what your comments seemed to be about.
It seems you really did try to portray the state of things as they existed in the 19th century as applying to much earlier periods, and you were apparently unaware of the role of the Portuguese invasion in subjugating the native powers there - which is what actually paved the way for actual Arab political domination later on. And you now seem to be grasping at other more tangential points to try to make your initial characterization seem accurate.
1) The French actually let slavery persist for a while after in some of their colonies (even though officially banning it), then not long afterward started imposing forced labor, almost completely defeating the point. The British too imposed forced labor on some of their colonies as I mentioned already in another thread. Just because they were no longer subjugated by one person that does not mean that the notion that such people were suddenly "free" is not questionable, when they were now subjugated to an entire foreign country's government.
2). Vernet's analysis doesn't really agree with Coupland's claim, his own conclusions are clearly somewhat different. He just mentions Coupland's claim to note the interpretation that was used to justify certain actions of that time, but as he notes, the claim is severely lacking in evidence.
3) Yes, the Muslim world was very much involved in slavery. I think we both agree on that actually. The only issue is the claims you were making about the Swahili area. Even your portrayal of trade was off the mark, since the early Portuguese sources actually primarily emphasize gold and ivory, with slaves only being emphasized to a comparable or greater degree much later on, and of course when the slave trade reached much greater heights there in the late 18th and the 19th centuries slaves were the biggest focus of trade as you stated, but not earlier.
But anyway, the point is, the situation was far more complicated than what you were portraying. A king of Sofala whose title as ruler is given as "Mfalme" (a clearly Bantu word) in a 10th century Arabic source, is obviously not an "Arab invader" for example. And when Duarte Barbosa (a Portuguese explorer) gives the following description of Angoy (Angoche, in present day Mozambique) he is not describing some "Arab Islamic imperialist invaded" society under Arab "tyranny":
". . .there is a town of the Moors on the sea coast, which is called Angoy, and has a king, and the Moors who live there are all merchants, and deal in gold, ivory, silk and cotton stuffs, and beads of Cambay, the same as do those of Sofala. And the Moors bring these goods from Quiloa [Kilwa], and Monbaza [Mombasa], and Melynde [Malindi], in small vessels hidden from the Portuguese ships; and they carry from there a great quantity of ivory, and much gold. And in this town of Angoy there are plenty of provisions of millet, rice, and some kinds of meat. These men are very brown and copper coloured;
they go naked from the waist upwards, and from thence downwards, they wrap themselves with cloths of cotton and silk, and wear other cloths folded after the fashion of cloaks, and some wear caps and other hoods, worked with stuffs and silks; and they speak the language belonging to the country, which is that of the Pagans, and some of them speak Arabic. These people are sometimes in obedience to the king of Portugal, and at times they throw it off, for they are a long way off from the Portuguese forts." - Duarte Barbosa
Obviously none of the characteristics described in bold really match those of real Arabs; there are other descriptions that are like this which indicate that the cities were mainly native east African city-states with an Islamic overlay and often an immigrant or immigrant descended population. And of course the fact of literature (poetry, letters, etc.) written in the Swahili language makes it even clearer how far off the mark the idea is that the Swahili region was simply an "Arab Islamic imperialist invader" dominated society. Even the reference to Mogadishu as being under "Arab Islamic imperialist invader" rule or "colonialist" rule and "tyranny" by Arabs for "a thousand years and more" is strange since we have an explicit statement from Ibn Battuta that the city-state was ruled by Somalis (as I explained in the thread I linked to in my previous post). Yes after the Portuguese invasion there was Omani Arab domination of much of the Swahili coast after the Portuguese were pushed out of the region by Muslim forces, but prior to that, the region was not really like what you were trying to portray in your previous post.
I"ll quote for you an academic view which gives a more accurate idea of what the situation was like as far as the foreign presence, prior to the Omani dominance of the area. When describing the situation on the Tanzanian coast, Neville Chittick, who was one of the foremost researchers on the Swahili area, wrote:
"Their society was primarily Islamic, and their way of life mercantile. This does not mean to say it was Arab; the immigrants were few in number, and intermarrying with African women and those already of mixed blood, their stock was rapidly integrated with the local people. Probably by the second or third generation they would have abandoned their spoken language for Swahili or the local language, though retaining Arabic for writing." - Neville Chittick, "The Coast before the Arrival of the Portuguese" (1968), in
Zamani: A Survey of East African History
4) The "Seng Chi" slaves were probably "Negritos", not "....." slaves, despite the name corresponding fairly well with "Zanji". Probably they were called that by some traders because of their dark skin and appearance (which has similarities to that of actual black African people). Of course some earlier studies in the 20th century erroneously assumed that the slaves referred to in those references were actually "....." (black), but more up to date studies usually indicate that they were "Negrito", not African. You can read about the "Negrito" connection here:
Archäologie und Frühe Texte
"The Kunlun slaves were imported into early Guangdong through two channels. The first was tribute trade. From 670 to 818, for example, Sri Vijaya and Java ("Zabedj" in contemporary Arab and Persian records) dispatched at least five such missions which presented indigenous Malay negritos, both female and male, to the Tang court. Occasionally these dark-coloured slaves were also called Sengzhi (Zangi?). The second channel was maritime trade outside the tribute system."
One can also find a few older sources mentioning that they were really Negritos as well though. For example:
The China Review, Or, Notes and Queries on the Far East
And anyway, the numbers involved in those particular tribute missions are not so substantial. The particular mission in 614 that you mentioned only included two slaves for example.
5) I think you're off the mark about the coinage issue. Originally foreign immigrants to the area probably did introduce the practice of using such coinage, but this hardly proves the sort of angle that you were portraying to be correct.