He said he did it and appears to have described in detail how he did it. It's his confession coupled with the fact that he fits that seems to be giving the Germans confidence.
If I'm remembering correctly, he admitted to taking her & claimed that he knew what happened to her. I don't think the confession went further than that, did it?
Here's a possible scenario that fits the accumulated facts:
- CB took her from the apartment
- he filmed whatever happened to her, to create a video to sell, either to order, or via the dark web
- she accidentally died during the abuse
This would correlate with what his ex-girlfriends said about him telling them he had a 'horrible' job to do, that would change his life and mean he had to move away/lie low.
It would also explain how he came into a large sum of money enabling him to buy the disused factory premises.
It would also fit with the chatroom conversation - where he says 'finally' he wants to abuse a child, suggesting he hasn't yet done so himself (though he may have seen it being done). Plus his knowledge of how such abuse might lead to the victim dying (the awful 'deep throat' comment).
German police may have come into possession of that video, from an informant, or from breaking up the




Only thinking out loud here & trying to make a picture out of the jigsaw pieces!