Who else removed it?
Users cannot delete posts. Spam is not automatically removed.
So unless the C9 database server has some subtle hard disk corruption that only affects posts by GNU zealots...
http://channel9.msdn.com/forums/Feedback/478107-Spam-Comment/
It could have been me but I honestly can't remember. If I removed it, it was because of Ubuntu being disrespectful against other members, not because of his Linux trolling.