Because it come up in the comments I went back and reread Greg Cochran's posts on Jared Diamond mostly from 2017 - they are mostly negative - and the discussions in his comments sections which are populated by people with both scientific and general knowledge. Also, occasionally, wit.
It's a fair number of posts, and the topic is controversial. Still, it may reward your time. I would pay attention to the dates each one was written, because sometimes the order matters and it is not naturally in the best order.