It always has, but it's already defedded for them on the old instances and if noone on their specific instance is following a new CSAM instance they shouldn't see it unless someone starts replying into their threads.
Discussion
I got a few taken down this year my self lol
I saw you talking afterwards to one of the guys who hosted one of them. I have a sneaking suspicion they may have set up the introductions spam as revenge but that's purely speculation on my part.