This hurts a lot to watch, but I really appreciate the conclusion she draws at the end about showing gratitude for positive impacts even if the experience isn't great as a whole. A few times I have gotten thank-you emails after a semester that have remained extremely meaningful to me many years later. I wish I could let them know the impact it had, but I'm not going to hunt down old students. I would say don't feel any need to send something if you don't fully mean it though, platitudes after a student sees their grade are not the same. They're not insulting but if it feels like a template the student could send to all their professors with a couple changes it just comes across as networking.
The "thank you for caring" note resonates with me a lot too. About a year ago after I started breaking down I had a lecture where I really didn't have my shit together and it was embarrassing. I knew I was half-assing my prep for that day but I just needed to show up. I was kind of caught off-guard when three students stayed after, but it meant a lot to me that they phrased it as "are you okay" rather than as a complaint. I opened up more than I should, definitely more than the teacher in that video, I knew better but I was too broken at the time. I think support from an unexpected place was helpful. So many of the people I have come across in my life have been exceptionally kind to me, that's really why I haven't ended up like that woman.
I have never played Mario 64 outside of a couple five-minute sessions on a Toys-R-Us demo when I was maybe 10, but the Watch for Rolling Rocks half-A-press video - a speedrun with the added condition that a longer time will trump a shorter time if the player presses 'A' (jump) less than in the faster run - is almost unquestionably my favorite youtube video ever. It's a hilariously silly niche thing, but beyond that it's like watching someone try to explain their doctoral dissertation, making their best attempt while knowing full-well both that they won't be able to get their audience to follow every piece and also that no one else is as engaged in the topic as they are. As long aa I don't feel like a captive audience, I can find a real joy in exposure to that sort of enthusiasm. Laying that on top of something that's just a little funny hits the spot for me so much.