> From the results of the study, one would infer that if they adopt these 4 traits, they will become CEOs.

Did you read the article? They were looking at what makes some existing CEOs more successful than other CEOs. Nowhere did they say these traits were what allowed people to become CEOs. In fact they kind of said the opposite - boards tend to over-index on different traits, like overt confidence and extroverted charisma, when hiring.