This seems to be Piefed-specific; if I’m understanding correctly, it seems that the only way to “migrate” a Lemmy community from one instance to another is to simply make a new one on the new instance, and make a post in the old instance directing people to the new one. It doesn’t seem like it’s possible to actually transfer the content, posts, subscribers, etc from one to the other.

Does that seem correct? I’ll keep studying up on this regardless.