Hear hear! I'm currently learning DIY synths from that very channel too, currently on episode 3, very good videos for laymen. Although some extra resources are needed if you want to have further understanding, as he doesn't go too deep into theory, but for being video instructions/tutorials, I find that the balance is good on that.

I haven't watched any of the lectures, but there's also Georgia Tech's Analog Circuits for Music Synthesis https://www.youtube.com/playlist?list=PLOunECWxELQS5bMdWo9Vh...