The professor's point is about group brainstorming, not individual brainstorming. Indeed, what he says in the context of brainstorming (see around 13:00 in the

The professor's point is about group brainstorming, not individual brainstorming. Indeed, what he says in the context of brainstorming (see around 13:00 in the interview) supports individual intellectual effort as a better way to come up with good ideas.