It technically qualifies
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I thought the term "Fediverse" specifically referred to software that uses ActivityPub to federate content across instances. Like how Git is decentralized, but it's not federated. Now I'm confused.
You are right, op uses the term incorrectly.
I've also seen it used for software like Nextcloud. Not to say that is the proper use as Nextcloud isn't even close to being related.
Nextcloud had ActivityPup support (I think I heard they were deprecating it though)