Reading through the admin’s post it looks like they have the exact same issue with chapo.chat being registered by an admin who is no longer active and not responding to the rest of the admin team. They explicitly say to view the move to chapo.chat as temporary unless they can get control of that domain.

Sounds like a good lesson for them and many other fediverse instances to form some sort of non-profit/club/organization legal entity and better ensure that these critical items are open to multiple individuals to reduce the bus factor. I would assume having a legal entity would make it easier to get donations to cover costs too.