The short answer is that we don’t know. It has long been a legal grey area when depicting porn of underage characters that are clearly not real. There’s the classic “she’s actually 1000 she just looks 6 years old” and “all characters depicted are at least 18 [despite all of them being in various stages of high school]”. American politicans are by and large way out of date with modern technology and cannot be expected to rule competently on the subject. Is the AI nude of a real person “revenge porn” or constitutionally protected free speech? People have been drawing fan art of underage celebs having sex with high detail for a long time (see Harry Potter/Twilight rule 34). Ultimately congress will need to make laws about this or courts will have to interpret a previous ruling as applying to these images. Unfortunately due to the Streisand Effect whomever is at the unfortunate center of this shitstorm will be forever made into pornographic material so we understand the general hesitation to get involved