Not when OpenAI publicly declared they trained on pirated works. I can’t imagine “we can’t tell if this is the result of the illegal thing we did or not” is going to stand up very well, nor does it bode well for any refutation of the plaintiff’s depiction of their intent. Part of fair use consideration is commercial impact and when you steal a bunch of books to train your AI model, it’s hard to refute that the impact is not negative or that you didn’t intend commercial harm.