I doubt very much that his posts have been deleted. His account has been suspended pending what ever review is going in the background and I would imagine that has included the hiding of everything he has posted as part of the review.
PPrune is a bit of the wild wild west in internet forum terms and a lot of transgressions are allowed to be committed without heavy handed moderation. For GTE to have been pulled like this would indicated that this is a very major transgression and would suspect is probably the result of abuse of privilge as a moderator.
I would suggest waiting for the truth to be known before lambasting the forum operators and moderators.