Solid financial success is largely the result of skills, hard work, and wisdom
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I think he is partially correct in that extreme risk taking is necessary to achieve extreme success, but I can't think of anyone mostly self-made in the Forbes top 50 who you couldn't argue is far above average intelligence, business acumen, or some skill relevant to their wealth. Risk makes up the difference. E.g. Musk might be top 5% in early education/opportunity, top 5% in intelligence, top 5% in business vision, and top 2% in work ethic, but it's the top 0.01% in risk appetite that results in him not being worth a few million (or wherever 0.05 * 0.05 * 0.05 * 0.02 ranks you in society), but the richest man alive.