Here is an post about bitcointalk account deletation. You can check this. Hope you will be clear.
Deleting accounts doesn't mess up any threads, like
this thread. It just changes to anonymous, with no profile information. Post stays intact.
As you can see here, I only change the username to "Anonymous" on request.
On top of that, there's the
About privacy page, in which, under the first table regarding retention, you will clearly see "
You cannot delete your account."
Also, the forum is under US jurisdiction, not EU jurisdiction. Under US law, there is no GDPR (the law on personal data).
However, it seems that the account will more likely be banned rather than deleted...