Earlier quoted context omitted.
He's an idiot in the sense that Trump is an idiot. Made billions (sure, not started from scratch, but they still made billions more than you and me), says stupid things all the time but they still can get away with it and win (the presidency, the most valued car company in the word, whatever it is they want).
Trump started out with 100's of millions. Musk started off significantly lower on the ladder.
Sure, a $1 million dollar loan from family is pretty generous, and an amazing starting place - certainly not a "from nothing" tale. However, it's not outlandish money for a business loan to a top-rated business school graduate with extensive industry experience either.
I'd also wager if you gave most people $1 million dollars, they would not turn it into billions within their lifetime.