I mean not to say that Chinese people that most of them probably never heared (or cannot) of the tank man would be a good judgment about truth which the government are hiding on a regular basis.
What I did talk about, was how the average people in China think about all these. Note that all "genocide" evidence present here, is available in China (not as raw material maybe, but referenced and discussed). It's very different from tank man, which is hidden in public discussion.
And since you mentioned, tank man (89 incident as we call it), is actually a well-known fact (I might be biased, but since high school, my peer occasionally talked about it). It's just forbidden to talk about it in public.
War is Peace, Freedom is Slavery, Truth is Myth?