As autistic person, I am not surprised. People hyperfocus on interests which scratch their itch (people with autism tend to be better at hyperfocus). A hyperfocus on gaming (specifically physical sports) fits in an autism profile, as does a hyperfocus on building a large (virtual) world. Keeping the build to yourself is akin to writing a book, not publishing it. In this case, the book is published.
If you will, he is manager/coach and player at the same time in Minecraft. Or, from a different PoV: IRL he is the coach, IVL he is the player (gamer).
Notice how his son did setup the A/V aspect of the recording, and how he is terrible with controller. PC gamer! I'm 40+ and would be terrible with either as well, CBA with it either.
Btw, I watched the video with my kids. They're aspiring Minecraft players, and enjoyed watching it -in awe- with me.