Well, I’d certainly see it still more like ActivityPub. Only different is there are no actual login servers. You get 8 default relay servers that help relay your messages, and there are over 200 I think. Nostr is a different way of doing ActivityPub, but your identity stays with you (not on a server). A week after I tried it, I did this video at www.youtube.com/watch?v=8mSyMCJlSwA trying to explain some of the differences and similarities (like I did before for Lemmy, Mastodon, etc).