I don't think we need to look beyond "the post shouldn't be here" to consider its merits. The post you link doesn't appear (to me) to establish policy, the top two answers are by non-moderators who are sharing their opinions and, at least
this case, how they deal with such cases. That particular answer notes that accounts for troublemaker users
can be merely "deleted" vs. "destroyed", which from what I could tell preserves posts rather than deleting.