establish a platform discussing history of Tiennaman square or Uyghurs without strictly adhering to government set guidelines, then they will likely be prosecuted.

Tienanmen square has a 600 year history. You're referring to one event, which is censored. But even that doesn't cover the portion that is relevant to the history of Tiennaman, no part of the protests is censored. Uighur history also doesn't have any censors.

It is true that you have been able to identify one censor in your two topics (albeit with inaccurate wording). It's also a particularly sensitive topic with strong disinformation campaigns targetting it. In 2020, many states worldwide issued censors on COVID and vaccine related topics for similar reasons.