I found the admin's most recent comments and found this thread

It was a mistaken post removal and they've been busy. It's possible that @Sal@mander.xyz has not noticed the instance is down yet.

I have been neglecting the instance very aggressively due to being busy this summer.

And on the subject of getting more admins/moderators:

Yes, of course! Moderators are gold. I need to make a better effort at recruiting.