Tiananmen square is one of the most popular places in China, it'd be like saying Times square in new york city. You're referring to what they call the june 4th incident, and you can absolutely talk about it on chinese social media.

Lol, that's the worst attempts at spelling Tienanmen Square and Uyghurs I've seen yet, and I've seen a lot.

What’s a “secret” are not those events, but the garbage that propagandized Westerners believe about those events.

So you’re right, the “genocide” is a “secret,” and the “massacre” is a “secret.”