You think Perry is going to say he realized that he made a horrible mistake and reshot all her footage with a real actress? NAH! Are you dreaming? Of course he defended her and his decision to cast her in the film and says that he's shocked, just shocked about the all criticism he got.
Actually I wish he would have been honest and said the truth that her casting was a blatent attempt to attract a younger audience but he miscalulated. (Maybe he should have gotten Rhianna)