This seems like a big overreaction to me, so I see it as a clear PTB. I dislike the idea of banning people based on history in other communities, other than to check if they are a bot or advertiser or something obviously malicious. Trolling could mean something as simple as being sarcastic, and glancing through OP’s history they seem to be a real person who believes what they say, even if they can be quite rude about it.
But the upvote/downvote split suggests the community is more divided on this.
But Ada says they had been talking about it in that comment. They let her know they were thinking about migrating, and Ada supported their decision. Then someone from the 196 mod team let her know when they were working out things with LW. 196 mods did drop the announcement without giving Ada a head’s up, which is definitely bad, but by that point she knew the migration was being organized.