Actually in the meta game part, that's not what it means, it means that you cant say IC stuff in OOC.
In the nlr situation, thats a bad way for solving it,it says that player x accuses player y, so why you warn them both? First you need to go check the logs and see if player x killed player y twice or player y killed player x within 3 minutes.
In the situation of calling player x in ooc for help is also bad, he actually broke metagaming.
You haven't gave examples neither the explanation of RDM

for now.