The gist of it is that they are making The Making of Karateka. Which appears to be basically the same thing as a director commentary for a movie but a game. You can play different versions and jump into the game during recorded bits.
Suprised I've never heard of this game. Doubly surprised that it is the technological predecessor to Prince of Persia! Anyone who's played PoP knows how impressive the rotoscoped animation was for the time.
I love this. Commentary tracks are a huge part of movies for me (I hate how streaming services usually omit them). Definitely should do more of that for games.