That’s simply ignorant. Here’s Tom Mueller, co-founder of SpaceX on Musk’s contributions to spaceflight:

Elon was the best mentor I’ve ever had. Just how to have drive and be an entrepreneur and influence my team and really make things happen. He’s a super smart guy and he learns from talking to people. He’s so sharp, he just picks it up. When we first started he didn’t know a lot about propulsion. He knew quite a bit about structures and helped the structures guys a lot. Over the twenty years that we worked together, now he’s practically running propulsion there because he’s come up to speed and he understands how to do rocket engines, which are really one of the most complex parts of the vehicle. He’s always been excellent at architecting the whole mission, but now he’s a lot better at the very small details of the combustion process. Stuff I learned over a decade-and-a-half at TRW he’s picked up too.

This isn’t the story of a guy who just “had money”.