Lemmy is also ActivityPub-based and the original call was on Mastodon, so that may explain the connection :).
I mentioned what I could about Nostr given the scope of the interview. One way or another, if Nostr makes it into a study with key phrases like decentralised social media, it could attract further interest from researchers in Information Systems, Computer Science, and related fields. Or not 🤣... But I might just be on the weird side that actually enjoys contributing to this kind of thing.