It's not "other stuff", it's stuff other than Nostr.

It is as much Nostr as Google Drive is.

Nostr is a protocol. Nostr.build is an image host like many, it just happens to have "Nostr" in the name.

> You do realise the relays (the R in nostr) are just servers, right?

They are Nostr servers.

Not all servers are Nostr servers. Only those that operate through the Nostr protocol are.

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If one can access the servers with a nostr keypair, they are utilizing the nostr protocol.

Not necessarily.

Nostr keys can be used generally for asymmetric encryption and related task.

The Nostr protocol is a client/server communication protocol, as well as a data format.

Regardless, images aren't being hosted "on Nostr", in any sense, when nostr.build is used.