Because they know that someone is going to be more clever than them, faster than them, at some point, if they keep trying to do inside moves.
And also because they know that at some point, because of everyone trying to be cleverer and faster than everyone else... one day this is all going to blow up, and all the various kinds of leverage will unwind, and work backwards.
They didn't say they went 100% into gold, just thst they have a solid chunk in it, as a safety margin / defensive play.
Gold, on the other hand... much, much simpler, in the long term.
Generally less ROI than during a Bull run in the market, but it does always go up, in the long run... beats inflation!
If you see massive volatility in gold, that means some fairly big entities are ... rearranging their bets, so to speak.
On that note, here's the DJIA / Gold:
Trump's been great for Gold prices, Gold's gone up more than the stock market has, in his term so far.