Is there any tidy way to let me know which user was removed? That's a pretty big hit to take from one user's removal. Just curious.
Nope, sorry. This wasn't done by us (the AU mods), but by an SE employee, and they aren't telling. And correctly so. There are obvious privacy concerns involved. This is all we got:
One or more users deleted their profiles, and there's really not anything further we can discuss about the topic for privacy reasons.
I get that you're curious (I am too) but I also accept that users have the right to delete their accounts and not have that announced publicly. So I doubt we'll ever know more details.