I will try with another sport, see if you understand.
Football Team A: Throws the ball in the endzone 3 different times and drops 3 sure touchdown passes. Defender nowhere around just blatent drops.
Football Team B: Scores 10 points in the game and wins 10-0.
Did Team A hold them to no points, yes. Did they play good defense, no. Just because a team doesn't score doesn't mean they were well defended. They have a hand in it offensively too.