No, you're right the 1st time. It's eattherich, hosted at kbin. It's a weird side effect of federating. The original instance hosting the comm is gone, but all posts and comments go into the local instance first (in this case, Ozma's posts to .world) to be federated back to the main instance (kbin). Since kbin is gone, that federation ain't happening, and nobody from any other instance can view the content from their home instance. But you can directly view .world's local copy of what it thinks the instance should look like, which contains all of Ozma's contributions.
E.g., by setting up a subscript' to the community, or viewing individual threads and comments.
The interesting thing here, as the other responder observed, is it's the local copy of a previously-federated community.
I would have assumed that the copies would be read-only from outside the actual instance. But it sounds like you're able to post to the copied-communities too. Lul.
Naw dawg. You can either subscribe to the community or search for an external link from within your instance (e.g., for a thread or comment). The former will be recurring, the latter is per-search.
It's not always an instant refresh, and sometimes it doesn't pull in everything either. Other things can disrupt this like defederation, instance-level restrictions by admins of course, or even version differences and botched updates.
But, otherwise, you should be able to force a pull yourself as well.