> As far as I know, it's still some janky visualbasic UI with a M/UMPS backend (well w/ a modernization wrapper).

You are correct. They haven't changed in last 20 years. Even in their coding tests, they write pseudo code or ask you to write some code (with basic code grammar & layout provided), which is thinly veiled MUMPS.

And there's a proctor who watches you & your screen over remote connection - lest you googled anything related to the problems. It was very creepy