To say that the idea of one person changing the world has been discredited is so wildly wrong I don't even know where to start. We can't neglect the background but we can't neglect individuals and the choices they make either.
What we can say is that Musk presided over the growth of a company that has sold 2 million EVs. We can't say "someone else would have done that if he had never been born," which is what you said. Unreal.