Honestly, I remember thoroughly crosschecking his video with all the sources available to me, including South American resources, and I really couldn’t find anything wrong with what he said. It was a very well done and researched video.
I would recommend a lot of the books in his sources though. A lot of them are directly Peruvian, but they have good translations available.
Funnily enough, he actually excluded a decent chunk of the acts committed by the organization because it simply would have taken to long to cover them.