Really well-done! For short-handed sailors, it really demonstrates the importance of not falling off the boat!
It's still interesting to think of some sort of trailing line that could depower the boat when yanked, but no real practical way of doing that comes to mind so far. Maybe something that hasn't been invented yet, like an electronic proximity tag wired to the autopilot?
I used to do live-boat scuba diving 12-months a year in the San Juan Islands, and a couple of times somehow got "lost" by the boat. It is pretty demoralizing to see the boat searching back and forth in the distance, as the current sweeps you in the opposite direction. I had to self-rescue once by swimming to a nearby island. Submersible VHF (e.g. "Nautilus")would have been the ticket, I suppose, but didn't exist back then and still seems pretty pricey. Neither did the "safety sausages" that you can inflate to increase visibility. Something like that might be a good addition to a life vest pack.
I'm not sure where you're going with the contest to tag other sailors YouTube channels... Some of those guys have done episodes on their MOB drills and safety briefings, in years past. I haven't seen one as informative as yours though.