Police investigation remains open. The photo of one of the minors included a fly; that is the logo of Clothoff, the application that is presumably being used to create the images, which promotes its services with the slogan: “Undress anybody with our free service!”
I don’t know about AI nudes. But with normal AI generated pics, they have a specific style and genericness to them. Don’t get me wrong, many AI generated pictures are hard to distinguish from real photographs. But on the other hand, many real photographs are easy to distinguish from AI generated pics. So you’d probably need to take the nudes in a specific way to have plausible deniability.