It's because I'm commenting from nostr over the nostr/activitypub bridge. Looks like it doesn't give us very user-friendly names over on your side.
nostr:npub1g7ec7nfhyyus6kmtaaud4clnuwygandlrpz0hvem3pep6dndtjyqumtp42 That is a hell of a username you've got there!
Discussion
nostr:npub1g7ec7nfhyyus6kmtaaud4clnuwygandlrpz0hvem3pep6dndtjyqumtp42 😂 I thought it was intentional! Like, "Pff, you kids with your pithy usernames. Here, check THIS shit out."
Actually, in a way that's not too far off. What you're seeing is my pubkey in hex. That's what people on the nostr side do use to refer to me, but for most clients they make it much easier to do.