Looks like there is kind of a new Easter egg or a "special" way to show Tesla how much you like your car. If you slide your finger on the car icon on the touch screen a few times (like you "pet" your car), then a message will appear saying "Thank you for your feedback. If service is required, schedule it in mobile app." Noticed in software 2020.16.2.1, but it could be there before. Never seen anybody mentioning it... Short video:
I like your interpretation, but I think a press and hold on the controls button just triggers a regular old bug report: Holding down the Controls button makes "Thanks for your feedback" on the instrument cluster. Elon did say there are more Easter eggs people haven't found yet.
Late at night, I peek into the garage to make sure the door is down. And then I say: "Good night, Tessie." I haven't heard any purring but I think she probably likes that.