So the Chinese government is ok if people publicly talk about it?

The media is mostly what matters, because it mostly shapes public opinion, which is the goal of propaganda. Scholarly works and classes at elite universities have a lot more freedom than corporate media, including bookstore chains.

Yes. Quel surprise. Our media about their government is bullshit.

The Chinese government has an official policy of not discussing any historical events that are deeply controversial due to the broad international propaganda that it cannot control. When a dozen or more countries are all producing literal fabrications about the event year after year, it's just worth trying to win the debate by speaking truth to power. Instead they just choose to say it's not something they're willing to discuss.