I just want to provide you with another data point. I may well be in the minority, but nevertheless I am a bonafide contributor and enjoyer of HN. I should also point out that I did not and would likely not flag posts about the Tienanmen Square Massacre. However, there is a sense in which I could be construed as being "sympathetic" to the CCP and I'm 100% British. I am not sympathetic in the sense that I support the murder and cover up of protesting students, rather I am unsympathetic to the idea that the CCP is motivated by a cartoonish idea of despotism. Whilst I do believe that the most significant component in the censorship of Tank Man is formal CCP policy, I don't believe that extends to the wider conversation. My feeling is that the majority of non-Chinese commentators are disproportionally informed on Chinese history compared to Western history. For example the Opium Wars, or why Hong Kong was a British colony, or the effect the Century of Humiliation had/has on the Chinese collective consciousness. Again, to make sure I'm clear, there is no possible justification for state-sanctioned murder. However my "sympathy" is that we are failing as intelligent and caring fellow human beings if we cannot imagine the CCP as anything other than a Hollywood-esque super villain. So whilst I know I push against these stereotypes, and I suspect so too do Chinese nationals, that doesn't mean I also push against attempts to censor The Tienanmen Square Massacre.
So I'm not trying to disprove your point that censoring is actively occurring, I just want to try to add some nuance to the situation, that there are other currents at play here. And that when sweeping sentiments are expressed and reinforced about China there's a danger those other currents get drowned out and even misconstrued. So if I'm interpreting @dang's intentions correctly, I very much support his attempts to navigate this almost impossible situation with fairness yet firmness.