Yes that's correct, new instances don't backfill old content. Only the servers online and federated at the time of posting will have the content.
If you migrate to a new instance that wasn't online or federated earlier it won't have your old content
Yes that's correct, new instances don't backfill old content. Only the servers online and federated at the time of posting will have the content.
If you migrate to a new instance that wasn't online or federated earlier it won't have your old content