If you’re talking about historical accuracy, this could work without the creator making it political.
But going by your logic, anything that redraws the borders is “offensive,” despite the fact that it happens all the time in the video game industry. Like how America’s entirely western seaboard was colonized by an imperialistic regime in Project Wingman or how the Russians/Chinese/North Koreans/Nazis managed to take over the world. In fact, this is actually the backstory for Steel Battalion; except it was the Chinese who managed to push the American armed forces into Mexico by destroying most of the semiconductors in the world.
What I’m saying is that it depends on what you’re using it for and the creator isn’t taking a side on whether or not Taiwan deserves to be it’s own country.