Adrian Zenz is a right-wing christian fundamentalist, in his own words, "sent by god to destroy the CCP". For his mission, he is ready to make up lots of crazy stuff. After he gets proven to be factually wrong or that he does not in any way have any form of scientific evidence for any of his claims, he doubles down on them. His "research" does not follow any scientifically acceptable method. For example, the figure millions of detained Uyghurs came from a sample group of 8 (eight) interviews. So even if you ignore his religious views and his political motivation in his work, the lack of scientific methods makes it unacceptable to cite him in a paper.

Lots of people put lots of effort into debunking his claims. Use a search engine and dig in!

Or use the opposite approach, thats what I did! Around 2019 when Zenz came up with his claims of the Uyghur Genocide, I was so shocked and found them so crazy and unacceptable that I really wanted to learn everything about it and find the evidence, understand whats going on. I had an unfavorable view of China (to put it mildly honestly) and was super motivated. Well... never found any evidence of genocide, cultural genocide, or anything coming close to such things, but it almost turned me into a Tankie, so always remain critical 😊