Gaon –
My comment was aimed at the moderators of the group.
Who decides who can be defamed?
If someone were to say that Rav Moshe Feinstein zt”l copied a teshuva from someone else or that Rav Aharon Kotler zt”l forged someone’s signature, would the moderator not censor it? I would hope that he would.
I am not comparing the personalities or their galdus b’torah but merley pointing out that I would expect the moderators to prohibit anything which might be libelous. No damage can caused by being machmir in that .