If you actually sat and read it, you'd see that it's a piece of software that sits on each device connected to the USB switch and detects the USB disconnect/reconnect events which trigger when the USB switch is triggered and uses them to detect that the device should try to take control of the display devices.
British copyright law states that books enter the public domain 70 years after the author's death, in this case, 1954. So hopefully in a few years it'll be accessible.
I'd be careful trusting anything being piped from Andy Ngo, he has a history of being affiliated with, and giving preferential coverage to some pretty nasty far-right groups [1].
I've been contributing on and off to the project since it went open source (#4 on that page), it's an interesting experience communicating with blank faces that you can't know or find anything about.
Unrelated: About a year in they sent me an award[0] for continued contributions, but there's a puzzle on it I'm yet to solve; if anyone runs across this I'd appreciate any input!
I've been on a bit of a Michael Lewis binge myself recently, just finishing his book "The Undoing Project" - would definitely recommend if you're even tangentially interested in human psychology. It's a great introduction into why we make errors on a cognitive level and is a great follow-up to some of the concepts discussed in Moneyball.
Not OP, but my dad was in a similar situation to yourself - when I was 12 he bought me an Arduino kit for Christmas and we spent the holidays building projects together. When I was 13-14 he started taking my sister and I to CoderDojos. I'm not saying this will work for every kid and I was nowhere near as advanced as this guy at his age but it has given me a what seems to be a great career path post-university and a good background in open-source software.