I read a book about famous hoaxes in archeology, and the author told a story in the preface that is basically the same thing.

He said he used to get all these mail order books about a variety of different subjects and was shocked that the revelations and counterfactual narratives they presented weren't mainstream knowledge. The books all sounded logical and well supported by evidence to him, yet they shattered accepted norms.

Then he ordered one that dealt with anthropology, which was his field of expertise, and everything in it was complete bullshit- half truths, the truth twisted and misused, and outright lies. He then realized that all the books he had been reading were complete bullshit, he just lacked the expert knowledge to spot it.