Not an admin, so I can't tell you for sure. Lots of times they edit titles they feel are designed to "game" the HN audience. Posting "why hn doesn't need a new algo" if you aren't part of the HN team likely was viewed as either misrepresentation, or an attempt to game.
I don't have any direct insight just my experience in the past.
In that case, it seems odd to allow the original post title of Why Hacker News should use a different Deterministic Algorithm, Not a Random One but not jedberg's.
I don't have any direct insight just my experience in the past.