How can you possibly adjust a rating based on a game not played? It affects his tournament results....
Rating, if you get yellow and run

if he told the T.D. and withdrew from the tournament, no. It won't hurt is rating. However, if he didn't tell anybody that he was leaving, the games would count has forfeits from him.
I know a player, he seems to be protecting his 1700+ rating, though I think he's not there any more...he got beat by a 1500 player at a coffee shop, and I, who am maybe a 1400 player, played him a close game before he beat me by a couple of pawns. Anyway, at a recent tournament, he played a lesser player and won, then got beat by a much better player, then quit and went home. He didn't play his final 3 games. By leaving like that, those 3 unplayed games won't hurt your rating?