

You sure about that? They have a legal obligation to keep this trace, and it sounds like it would easily qualify as a legitimate interest. We’re not talking about some third party logging a visitor’s IP, but an ISP, that have a requirement to keep this information.
The GDPR isn’t making all personal identification data inaccessible, they restrict how they can be stored and accessed. If there’s a legal requirement and/or a legitimate interest, they can be stored, and if the data exists and is requested by law enforcement, it’s likely that higher agreements will hold.
And there’s never been any kind of international cooperation between law enforcement ever, anywhere.