That depends on what the layer was, and there is current cases heading to supreme court that have something similar to that so we may see
however commentary is just one type of fair use and would not be a factor here, nor is anyone claiming the AI is reselling the original work. The claim is that copyright law prevents unauthorized use of a work in the training of AI, AI training could (and likely would) be treated as research, and the result of the research is a derivative work wholly separate from the original and created under fair use