They already have anti-China shit in the original show. The part with the Dai Li conspiracy and brainwashing.

Actually even before that, the Air nation being 100% based on Western exoticism of Tibet, which apparently means racially predisposed to being peaceful spiritual nomads (who live in one of several settled places nonetheless for some reason) and get genocided because their reincarnation prophecy challenges political goals of empire.

IIRC in some interview the show creators even pull out the line “hate the political party, not the people” when the topic came up