Fediverse admins, if you haven't already you might want to defederate the domain gup.pe
It's no longer controlled by the people who ran the Guppe groups service, so its accounts are all broken. It might be safest to just block the whole thing, and it would make your server's search results cleaner by excluding dead accounts.
(Guppe's domain was apparently bought against the will of its owners before it expired, due to some little-known clause in the domain's small print.)