I just stumbled upon this post10k on Gaming, which confused me a bit, at first.
So, who is this mysterious fellow with the unlinked name? A ninja? A community moderator who fell from grace somehow?
As it turns out, that was just the poster's display name before they had their account deleted.
Having a denormalized display name, but not for deletions, seems a bit weird. Shouldn't it say
deleted by owner, or
deleted by user2974
Another example for those with 10k on Stack Overflow.