Nope. You are using that term totally wrong in this context.

A federated system is a system like email, where individual users use the system though a centralized entity of their choosing. Nostr is closer to that model, due to how relays work. You choose the relays you use, and other users also choosing to use those relays can communicate with you.

But it's not a very good federated system, as that aspect isn't made clear. So a lot of functionality is in practice centralized, as it only really works if everyone uses an overlapping set of relays.