Yes, if a thread is started on MN slagging of NM, it is usually deleted.
If one over there is spotted slagging off MN, and someone starts a thread here about it, that's usually deleted too.
But now it seems that commenting on threads slagging off MN on other sites is permitted (and more than endorsed by MNHQ if it is correct that they were the first to mention it in here)
That's quite a change, and I hope it will be applied uniformly now. Leadership by example (compared to 'do as I say, not do what I do')