I can't see anywhere in the guidelines where there is any rule about not posting anything off-site relating to HN, or not identifying members of the community.

There isn't even a rule against what you are choosing to label a 'personal attack', but looks reasonably civil to me.

Even if there were such a rule, attempting to silence dissent outside the communities own spaces is behavior typical of a cult or authoritarian regime. A healthy community isn't afraid of people thinking and saying things that some of its members don't like.