We really have to stop defining it this way. Stop comparing value to GDP. It’s apples to oranges.
Tesla generated $98B in revenue in its last full year. SpaceX reported $18.7B. That’s $116.7B. That puts him ~67th, not 20th. And don’t call him an “economy.” That’s weird.
If Elon Musk were a country, he would be the world’s 20th largest economy, between Saudi Arabia (19th) and Switzerland (21st).