How? X is hostile to any party attempting to bring justice to its users that are breaking the law. This is a last recourse, after X and its owner stated plainly that they don't see anything wrong with generating CSAM or pornographic images of non-consenting people, and that they won't do anything about it.
Court order, ip of users, sue the users. It is not X job to bring justice.
X will not provide these informations to the French Justice System. What then? Also insane that you believe the company that built a "commit crime" button bears no responsibility whatsoever in this debacle.
It is illegal in USA too, so the french authorities would absolutely have no problems getting assistance from the USA ones.
Elon Musk spent a lot of money getting his pony elected you think he isn't going to ride it?
You really believe that? You think the Trump administration will force Musk's X to give the French State data about its users so CSAM abusers can be prosecuted there? This is delusional, to say the least. And let's not even touch on the subject of Trump and Musk both being actual pedophiles themselves.