They’ll claim it, but it’s actually still easy to determine if an image is AI generated with minimal effort.
Legitimate images will have a source and knowing the source will allow you to validate things like meta data and location/time the image was taken.
AI is really only useful for entirely synthetic images.
That’s a bit of a misanthropic viewpoint. Sure people will believe what they want, but AI images aren’t going to convince anyone who wasn’t already convinced, and they definitely will never serve as anything more than very temporary smokescreens that instantly betray the legitimacy of whoever uses them.