Either he never believed the propaganda he was spouting the past couple years or he just accepted the red pill from Morpheus
Tbh I've been pretty impressed with the Coumo change of tune. For the longest time he was the mouthpiece. I really think he took some time to reflect and understand what he was doing. I would not be surprised to see Don Lemon take the same journey. I feel bad for them on some level; they make it to the height of their careers and finally see the game for what it is.