I don't mean to be blunt, but YC, as an institution, doesn't really care about anything besides money. They're venture capitalists. That the CCP is putting Muslims in high-tech concentration camps is of little concern compared to how much they think they can make in the Chinese market.
There was also something about "Muslims in concentration camps" - but there's another link in this very thread talking about how Uyghurs are being put in camps by the PRC, so I'm not sure either how speaking truth to power got flagged.