I don't think that's his style. I suspect a poster who has a tendency to defend him.
You're right; it isn't his style. Poche was many things but never sneaky or dishonest. Sadly, he never listened to sense either.
As for the actual culprit, Matthew is surely able to identify him or her, and he might consider a temporary banning of the offender if we all ask nicely. In the meantime, open speculation as to the person's identity won't do anything except create (or increase) resentment at unsupported allegations.