Threads like this aren't going to reach the top of HN very often (or in my experience, other social networking sites either), they get flagged and downvoted to oblivion. HN policy prohibits me from speculating why, but you can fill in the blanks.

There have been multiple media reports, but it's reasonable you might not have run into them outside of the context of "the PRC is vaguely doing something bad to Uyghurs". But yeah, the reality of what's going on is kind of horrifying, and I think the reaction from other nations (including the US) has been underwhelming.