I don’t consider the PDS stuff to be fully federated. That’s just keeping your data on a different server, as far as I understand it. To be federated it needs to be a full interoperable server like mastodon, or lemmy.
You should also be able to host a non federated instance, or one with limited federation.
If they have moved past that, and I can open a server and have people sign up for accounts, then I stand corrected.