I don't know that mutual defederation is necessary, I think a clear warning that that user and users from that instance won't be able to see it would be enough. A red border on the comment with a hover tooltip explaining it seems like would work to me.
I don't know that mutual defederation is necessary, I think a clear warning that that user and users from that instance won't be able to see it would be enough. A red border on the comment with a hover tooltip explaining it seems like would work to me.