From the post: "Musk's success would not have been possible without, among other things, government funding for basic research and subsidies for electric cars and solar panels. Above all, he has benefited from a long series of innovations in batteries, solar cells, and space travel."
But was Musk the only one to receive those subsidies and benefit from those innovation? He stood on the shoulder of giants, but he was the one to make it a reality. That is the difference between the average and the great IMHO.