So does any site that quotes the book. Just being trained on a work doesn’t give the model the ability to cite it word for word. For most of the books in this set you wouldn’t even be able to get a single accurate quote out of most models. The models gain the ability to cite passages from training on other sources citing these same passages.

That’s maybe an issue. I mirror speech a lot, though. How large are the passages?

That claim is disingenuous at best, and misinformed otherwise.