Board Thread:Speculation House/@comment-24.247.91.107-20140511154823/@comment-4010415-20140905025123

I believe it was sometime last year. We didn't get any clue of confirmation it was him until Sheena stopped by. She proved on Twitter that she's the legit Sheena, and after she saw us discussing her and how we mentioned the Monty edit, she said that it seems that even Monty was suspected of being fake along with her.

So, it's at least implied that it was the real Monty.

Besides, that wasn't the last time Monty did something like that under the username montyoum. He also did some edits on TVTropes' WMG page for RWBY answering people's wild guesses.