The only people interested in this story are people who don't care about martial aarts. AFAIK Musk has no formal training in any MA. Zuck is a BJJ blue belt I believe. BJJ (Zuck's training) is mostly a ground game. BJJ matches are pretty boring to watch, it's hard to see what's going on, it's 2 guys on the ground trying to get advantage. Don't get me wrong, it's fun AF to do, but it's not a great spectator sport.
Zuck is also about 20 years younger than Musk. The entire matchup is so silly. If you want to go see bad BJJ, I'm sure there's a tournament near you this weekend. Go and watch the novice grades and you'll probably see better martial arts than what this thing promises.