I sent a private message to another user about deleted posts and minutes later several dozen of my posts were deleted by the 'administrator'.
Although, my comment is not about sending or not sending message on this forum, but about the reason you think moderator deleted your posts. Did you think moderator will delete many of your posts because you send pm to someone about deleted post or something? This is obviously not the reason. Posts are deleted if seen as spam and not worthy to remain on their forum, know that such posts would have been reported by some forum users. Improve your quality post.