The statement completely overlooks the importance of the ability to listen, to seek clarification. Speaking is important, but listening, soliciting opinion, and incorporating varied perspectives are underrated.
Look around you. How many of the prominent people you know got there by listening and humbly soliciting opinions? lol
Well, if you're out to con people, then yes, you don't have to listen to their opinion, only to shape them, but that never lasts. You cannot fool all of the people all of the time.