Oh is that what happens with a site ban? I knew it would prevent me from voting, commenting and posting on .ml (oh no!) Did not realize it would prevent them from seeing my posts lolol
Because user cm0002 is site banned from lemmy.ml, lemmy.ml rejects his comments on lemmy.ml posts, which means lemmy.ml won't federate those comments, which means those comments won't spread beyond cm0002's own instance, lemmy.world.
It will federate if he carefully chooses to reply only to people who aren't on Lemmy.ml, since it is their homeserver that handles the federation of those comment replies. I know because I've seen users who are site-banned from an instance and can still comment and have it appear in other instances because they were replying to someone who wasn't on the server they were site banned on.