If warren Buffet hold millions of bitcoin........
Foolish or low iq is i think will depend from person to person . warren buffet for example is an educated guy , he is smart so he isnt a fool or a low iq person . if he dont sell his coins at the pump , he cant still be consider as a fool/low iq but he can be consider smart or wise because he knows that bitcoin can grew more in the future and he can get alot of profit as much as when he sells his coins at an early pump .
As far as I know Warren Buffet is against decentralized cryptos so he is not having any crypto currencies I guess.But he still tryint to be rich by using smartness that is suggesting others to don't buy so which makes he will still be the most rich person in this world.
Balantly investing on the things based on the price of anything can be considered as fooling but investing on bitcoin can be the best decision of their life time.