Hmmm, you might have a case but maybe not.

The US Copyright office currently does not recognize protections for AI-generated works, and for portions of complete works that are AI-generated. For example, if a comic has graphics generated by AI but a script written by people, the graphics and character likenesses, etc are not protected by copyright.

For audiobooks, the original work and the accompanying recording are both protected by copyright. The audiobook is considered a derivative work, so it may still be protected based on the fact that the original work is rightfully protected by copyright.