This is his primary problem. When he presents his "facts" he is often not presenting obscure but well established facts, but wide-eyed conspiracy theories that have been soundly refuted and are not taken seriously by legitimate historians or scientists.

If he bothered to do even a little research, and look for original historical sources, such as contemporary accounts or archaeological evidence to confirm what he has read in his fringe conspiracy books (in other words if he bothered reading well-researched and vetted books from credentialed historians), most of his "facts" would evaporate and he would lose his plot devices.

I don't really care that he uses this stuff to create a narrative. It's fiction, after all. But I have a real problem when he presents this crap as fact to an audience that lacks the discernment to know better. He is, in my opinion, intentionally misleading people, and making them more ignorant, to line his own pockets.