Discourse is complaining about existing posts when attempting to delete a user whose only apparent writing interaction with the system was sending a private message asking for the account to be deleted. I’ve deleted that topic, and even then cannot delete the account.
This is how the profile looks like:
Other than the awkward negative topic and posts count, can’t see anything outstanding surrounding the problem.
Maybe it’s the negative count? Where is that kept? Apparently not in users table itself.