I can guarantee that all of the line art in the book itself is NOT made by generative AI, as I directly purchased/commissioned all of it myself. The cover was actually made for me by someone else (except for the text and logo, which I made myself) so unfortunately I can't definitively say for sure. I wasn't very aware of the specific quirks of AI art at the time so it's very possible someone gave an AI image to use.
None of the text or content within the book itself is AI generated.