Correction-- I was just able to trace back to see how I figured out what the community address was. When I mouse-over “[email protected]” on an old post of my own to the deleted community (from my profile), the underlying link is: https://lemmy.dbzer0.com/c/[email protected]. So I think it’s only because I am not on lemmy.world myself that this was revealed. I suspect when users are on the same instance where the deletion happened, the original name may not appear. Someone correct me if I’m wrong.