You seem to have reading comprehension issues. They said that this could be done to their body, which is 100% true.
Any picture of anyone can be processed with an AI, and "nudified". Yes, the AI generated portions of the image are fake, and likely won't resemble the person's actual body under their clothing. Results are probably more accurate for photos of people in swimsuits vs more conservative outfits but...
...that doesn't matter. If you're modifying a picture of a real person to make them nude, even without AI, it amounts to sexually violating the person in the original image. Even if you're just photoshopping their face into porn, that's fucking vile and I see no reason there shouldn't be real consequences for it - especially if these images are shared with others.
Nobody defends this shit like you are unless they are doing it themselves. With that said, reevaluate yourself and stop sexually violating women.