Quick update to my last post.
While I was writing the section on 8.01SC Classical Mechanics for that post, I mentioned I hadn't gotten to Prof. Vladan Vuletic in the lectures yet, at least not knowingly. He's part of the course, I just hadn't seen him in the lectures so far. Around the same time, before I even published that post, I sent him a LinkedIn connection request anyway.
He accepted on July 1, the next day.
So, technically, one of the professors from "no idea I exist" now has some record that I exist. That's it, that's the update.