Not really worried. Even if/when AI Bots start writing history books they still will have to be reviewed. Already today we have humans writing Nazi apologetics and it hasn't changed the scholarly view of Nazism. I do particularly love (odd word choice but I can't think of a better one) the books from the late 40s that have apologies in them that the research was delayed due to the Nazis, imprisonment, being forbidden from working because they were Jewish, fighting a war, etc. it's so casual and yet so impactful.

Our main job as historians is to evaluate evidence, we look at at the sources and don't just repeat what they say but examine it. In my work I go down to the very words they use. I've written ~50 pages on ~50 word passages before. So far what we've seen with AI bots (and spotting them quickly) is some very odd word choice.

So as long as we continue to have historians, and as long as we continue to examine these works -- no matter when, where, by who or what they written, then the field really isn't in danger.

Is there a threat to the general public? Sure. But again, no more than the already available things out there, and the fringe and extremists groups pushing it.