It seems fairly clear to me that if the depiction is obviously not real, that's OK - for example if it looks just like [celeb] but they have blue skin or 10 eye

It seems fairly clear to me that if the depiction is obviously not real, that's OK - for example if it looks just like [celeb] but they have blue skin or 10 eyes or 6 legs, or it's a cartoon, etc. But most people producing fake celeb porn are making images that, at first glance, look exactly like [celeb], and only on careful inspection do you see AI-telltales like wrong numbers of fingers. Easy to miss. The law is saying that these realistic images are not OK and the person depicted in them can sue, no matter how many disclaimers you add to the picture. It applies to well-made photoshops created by humans just as much as AI slop.