It's known because the mods didn't keep their mod helper account secure and helpers revealed that their IPs were all over it. Revu also misfired once or twice with the mod plurk account and people saw it.

What I find the most distasteful is how Pudding and Revu continue to lie outright to players by talking in their plurks wondering aloud what the mods motivations are, or trying to echo feedback the mods are getting that everyone knows they hate, etc. Please, just say nothing. People who know, know and you just damage your reputation by lying. You're making it worse.