Not sure if you saw it already but I made a post in c/sino that you might be interested in: https://hexbear.net/post/33959

Of course this was just from a single school during a limited time tour but it reinforces the impression that I got from looking into this issue which is that the only part that I find concerning is that the criteria for selecting people to attend the camps seems rather arbitrary.

Also the World Bank, which had been funding some of these camps conducted their own investigation and released this statement about them saying they didn't find anything that substantiates the allegations: https://www.worldbank.org/en/news/statement/2019/11/11/world-bank-statement-on-review-of-project-in-xinjiang-china