I feel like you can mention its existence and people can subscribe if they want? Most of his content is cross-posted bot content from Reddit though, so it's not like it's a lot more active. (I think he had 5 users subscribed?)
(On an unrelated note, I sort of wish there was a way to tell Lemmy that if I subscribed to the group printsf, if someone spawns a local instance of printsf to just incorporate that into my printsf stream automatically unless I say block that instance.)