Not reading through all the posts and links in the last 2 pages, but Zenz is a shady character affiliated with shady organisations and a clear political purpose.
I had found though that there is compelling evidence that hasn't gone through him.
1. There's the PRC's official birthrate stats that show a massive reduction in 2018 (from 18 to 10, forgot the units), while no other province has a similar decrease (they are all already at 8-10). Somebody claimed that was the year restictions on having >4 children were introduced in Xinjiang, but it seems unlikely that such a massive reduction in birth rate could be caused by people not having their fifth child. Instead, the narrative of people being forcibly sterilised seems plausible.
2. The ICIJ, which exposed the Panama papers, got hold of an internal PRC document detailing how to deal with detainees. While it doesn't support some of the wildest claims, it's obvious that there is mass surveillance, imprisonment, and forced propagandizing.
3.
@2cents here was showing satellite footage of ancient mosques being destroyed in ~2018. Long before this narrative had taken hold, and his sources were historians rather than foreign-relations think-tank types.There's been a lot more footage since then.
Don't have any of the links handy, but can try and find them if anyone wants to check it out.