And if someone thinks this guy is wrong, then they can write an article with their opposing evidence and interpretations. And that’s how we do science.
Among humanist sciences, history is probably the most satisfying one for geeks, because there is a concept of truth that, once established, is almost as indisputable as a law of nature. We know Julius Caesar was publicly stabbed by multiple people - that is a fact. You can argue about killers' identities, location, motives, repercussions, etc etc, but nobody can realistically deny that it happened without an even stronger theory of how to make all sources consistent.