However - assuming he said that stuff - I don't think it's particularly interesting or shocking that he wasn't hired at Netscape, especially if Netscape was at a point in the evolution of their company that they were hiring based on resumes/degrees/buzzwords, versus productivity or personal relationships or whatever.
SpaceX and Tesla probably ignored some resumes this week from people who will go on to found amazing companies. And from people who will never do anything interesting.
The fact that Musk turns out to be a good entrepreneur doesn't mean he's the right fit for any job. Would I hire him if I needed someone to run a startup, or scale up a startup? Yes, he's proven he's good at that. Would I hire him to clean my house or mow my lawn? No, I'm pretty sure he'd get bored/frustrated and leave to find a more interesting project. Would I hire him to work in a bakery, or as a glassblower, or a bus driver? I don't know, he might or might not be a good fit for those jobs.