When you haven't scored for about 23 games or whatever it is, your confidence is completely shot and the pressure on your shoulders is at breaking point so much so that even agreeing to take a penalty is difficult and terrifying psychologically. Scoring wont suddenly make him prolific because he isn't anyway but it will certainly help build his confidence back up again to the point that he knows he can score a goal.
Here's hoping he goes on a better run now because man do we need goals in this terrifying final run in.