given that they have enough willpower, commitment and a little bit of intelligence too.

Honus Wagner famously said "There ain't nothing to being a ballplayer - if you're a ballplayer." Successful entrepreneurs suffer from a kind of Dunning-Kruger misjudgment of their own talents. Note that the quoted language from the article mentions "intelligence," not "talent." Entrepreneurship requires executive functioning, a kind of problem recognition and solving that intelligence and analysis just don't produce. I understand this talent, because my Dad had it, and I don't.

As a lawyer, I represented "dumb" clients who had the talent. Some intelligence is required, but the ability to judge people and motivate people and get financing and get noticed and negotiate rents and, and, and ... are not examples of IQ intelligence. They are something else. You gotta know when to hold 'em and know when to fold 'em. That's a talent, enhanced by craft, but a talent nonetheless. Advising those who lack that talent to start their own thing is like telling a short fat clumsy guy to try out for the Lakers.