All that was said in a podcast I enjoy that the guy was someone known, some sorta sympathiser for the cause at least according to someone close to the organisation. Literally nothing else is known as of now. Source: Honigwabe, German podcast where a known speaker for BPE said so. Starts around here. They talk about the guy in blue at 30:30 and the specific part is 33:00.

All that was said in a podcast I enjoy that the guy was someone known, some sorta sympathiser for the cause at least according to someone close to the organisation. Literally nothing else is known as of now. Source: Honigwabe, German podcast where a known speaker for BPE said so.