I was talking about situation when available evidence is not conclusive. Confidently stating opinion and then insisting on it makes people look more skilled then those who assertively state that we need to research more. Having and pushing opinion in that situation is opposite of being "intellectually humble", but still good for your career.
Intellectually humble people have disadvantage in competition, although they may make better technical decisions.
That is not the definition that I perceived from the article. Maybe you are thinking of "Intellectually honest"? What I read was basically that Intellectually humble people are non-dogmatic; they will change their opinions and evaluation if and when new facts show their opinion as being incorrect; but they aren't restricted from forming an opinion in the absence of concrete facts, as you seem to be assuming.
Intellectually humble people have disadvantage in competition, although they may make better technical decisions.