Her ARK funds are just the 21st century Manhattan Fund. Anyone can be a genius in a superbull market. A rising market lifts all ships.
Plenty of traders weren't geniuses though they were the opposite to some degree. The most popular trade on here was shorting the SPX from 2010-2015. March 2020 shorting was really popular even after the market made a floor. Buying ARK funds would have paid nicely most of 2020.