No it doesn't. It says Zhuge Liang attempted "to exploit the multitude of barbarians to resist the superior state", i.e. Wei.
Irrelevant semantics. The point being, the Shu region was considered a barbarian region and not the Central State.
Here is another quote from Zhuge Liang in the Shu section of the San Guozhi urging Sun Quan on using the "the people of Wu and Yue against the Central State".
亮曰:「事急矣,請奉命求救於孫將軍。」時權擁軍在柴桑,觀望成敗,亮說權曰:「海內大亂,將軍起兵據有江東,劉豫州亦收眾漢南,與曹操並爭天下。今操芟夷大難,略已平矣,遂破荊州,威震四海。英雄無所用武,故豫州遁逃至此。
將軍量力而處之:若能以吳、越之眾與 中國抗衡,不如早與之絕.
And here is a passage from the Wu section where Sun Ce telling his subjects: "Zhongguo is in chaos. With the people of Wu and Yue, and the firmness of the three rivers, we can (wait and) witness how it unfolds."
策單騎出,卒與客遇,客擊傷策。創甚,請張昭等謂曰:「中國方亂,夫以吳、越之眾,三江之固,足以觀成敗。」
It's clear that Dong Wu and Shu Han were not considered part of Zhongguo but a region of the Manyi. It's not even until the Southern dynasties period that we see the southern regimes using Zhongguo to metaphorically refer to itself, yet even there we have situations where the geographic Zhongguo was clearly separate from the south. For example here is a passage from Song Shu about a woman coming from Zhongguo to Jiangdong (East of the river, or Southeast China today):
晉中興初,有女子,其陰在腹,當齊下。自中國來江東,性甚淫,而不產
Note that China was split into three states at this point, and each claimed to be the legitimate China.
Actually, I have yet to see Dong Wu being ideologically driven in declaring that it is the sole legitimate dynasty; it seems to be the Wei and Shu Han which is adamant in fighting over that. In this case, Dong Wu is no different from Dai Viet.
Also, the claim for legitimacy pertains to
all under heaven, which is the whole world that matters, including Vietnam and North Korea at the time, which were under the control of the Wu and Wei respectively, not just the central state (northern China).
San Guo Zhi was also written and sanctioned by the Jin court, a direct successor of the Wei dynasty. It makes sense for them to emphasize the legitimacy of the Wei at the expense of the Shu and Wu.
Sanguozhi also cites directly from the Wu and Shu records, and the quotes I presented are from the Shu and Wu sections of the book respectively. Throughout the entirely of the Sanguozhi, there isn't a single passage I've seen where Zhongguo referred to anything but the north.
If Zhongguo being used metaphorically by the southern dynasties meant that it is the same state as the north, then even Dai Viet is more "Chinese" than Dong Wu; because it used Zhongguo at least to metaphorically refer to itself while the later didn't.