But you can make these statements on Facebook, X, and Reddit too.

Maybe. Unless a LibsOfTikTok account comes by, flags it, and unleashes a legion of flying monkeys to report hysterically until it's taken down.

What you're describing isn't free speech.. It's security through obscurity.

Also, I can openly discuss US massacres against indigenous populations. Can Chinese citizens openly discuss the Chinese genocide of the Uyghurs?

Firstly, no you can't. "Woke" academics, teachers, and journalists routinely lose their jobs and platforms for openly discussing US genocide. From Donahue to Katy Halper, we've got a decades long history of people getting sacked for questioning our police state at home and wars abroad.

Secondly, yes they do. Unfortunately, it is very hard to get Chinese national news and social media via American search tools because it is routinely censored. The best I can give you on short notice is Al Jazeera coverage of Chinese coverage.. But the idea that people in China just don't know anything is happening in Xinjiang is about as absurd as claiming Americans don't know what's happening in Palestine.

Same with Russia. They get round the clock news coverage of Ukraine, both through domestic and international press. They are well aware what Americans accuse them of, in the same way we're aware of what Iran and Syria accuse us of.

while America isn’t great, it’s not as bad as some

It's not so bad, because we're not the ones getting the business end of a military crusade.