Pedophilia is more often than not not purely an attraction to the kids themselves, but to the taboo and degeneracy of the act. The evilness of it is what turns them on, which is why things like Early Porn Introduction and Grooming are such an integral part of the overall problem.

In this way, the AI porn would probably make the problem worse, as the normalization of "jerking it to something so awful" will lower the enjoyment they get out of it and lead them to further and more fucked acts a lot faster. Whether that's forcing it on other people (like BLACKED spammers do) or getting further down the rabbit hole (like trannies and cucks do).