No, their history doesn't matter when talking to their players about their performance, when it's done privately. Not on the pitch, in front of the opposition and fans.Agree that he's a cunt, but disagree that a manager that was an average player can't criticise or impact a good player's game. That's literally a manger's job & their history as a player doesn't matter when he talks to his players.
A manager is a manager. It doesn't matter how good you were as a footballer. You manage.
Otherwise he just becomes any other cunt in the stadium telling a person 1000 times the finisher he ever was/will be that he cannot finish and it's their fault the team came away with nothing.