Basically, if you defederate with a site, activity-pub will no longer send activity updates to that site and will ignore updates from that site

So if a third site makes a post, then someone from .ml comments on it, it’ll send the comment to that third site and that site will update the post it sent to .world

And I think in Lemmy, that update (the .ml comment) would be ignored by .world. So if you look at the post on .world, the local version of the post won’t be updated with that comment

But in this case, the original post is on .world, so I don’t think .ml should even be able to see it if you’re defederated…

I see an .ml comment and a reply from blahaj… Maybe .world has a site-wide block instead of defederation? In which case it’d be as if you have blocked every user from .ml