As I understand it, federation is not necessarily reciprocal. If your Kbin server federates with another server, you will see their content, but if they don’t also federate with your server, they won’t see yours.
For the record, I’m on a Lemmy server and I can see content from Kbin.social just fine.
I am able to subscribe and see new posts since my subscription. That wouldn’t happen if they were de-federated, would it?
As I understand it, federation is not necessarily reciprocal. If your Kbin server federates with another server, you will see their content, but if they don’t also federate with your server, they won’t see yours.
For the record, I’m on a Lemmy server and I can see content from Kbin.social just fine.