I assumed that the reason for the look was because a recent power cut borked out Firewall/Router at the office, and I get loads of HSTS and self signed certificates errors for certain websites (this site included) and it was defaulting to the old editor. I hadn't noticed the emails until you mentioned it though.
I did wonder if it was due to the release of WP 6.0.0 and SSC had upgraded to that, but they're still running 5.9.3. /shrug
Excuse my typos and sometimes awful grammar. My fingers work faster than my brain does.