Given the amount of money involved, it is pretty disingenuous to compare the net worth grow of any person, not just Trump, with S&P performance.
If some random guy in ET inherited 200 million (or much more in today's dollar) would they go all in on S&P, or start some business, or just retire and stick at least half of it in US treasury bond or similar stuff that is "safer"?
If the Ultra rich guys don't need "safety", the JGB wouldn't trade at near zero.
You are just raising the bar to prove he is not any good, which is not a good argument.