I noticed this question (now only seen by 10k users) does not have one of the "required" tags.
I tried doing the same with a test question and got the expected errors (both as a normal question and as community wiki).
Is it just that the original author was a moderator at the time, so no rules apply?
EDIT: Seeing as this is the answer, I'm promoting my parenthetical question:
- Was he at least warned he wasn't following the rules?