Not a fan of him because he's anti-communist but a critic of him still said China is running "internment camps in Xinjiang as part of the "preventive measures against extremism"".

Further info from Wikipedia:

Zenz's research is primarily based on publicly available documents and social media publications by Chinese authorities and local governments that originate directly from the Chinese state, and his research remains "scientifically tenable", even if it is "instrumentalised by the US government for its harsh anti-China policy".

Tenable means capable of being defended or maintained.

He doesn't sound like someone I would want to be around but that doesn't mean he is wrong.