I watched the latest one you posted with Harry. He definitely has opinions about raw vs. cooked. As in, he LIKES cooked meat, and raw doesn't appeal to him. You might try sharing with him the number of people, including my girl friend, who now doesn't enjoy cooked meat at all, and is becoming a fine judge of great tasting raw meat. Same was true when you give someone full fat milk who has been drinking one percent for years, or vice versa. he won't want to admit he's caught in his own routine,, so you may have to lead him to where he discovers it himself. I used to work in a lab, and if we wanted to work on any particular project, we would say to the director of the lab,,"remember that idea you had to ..." and then he would say, 'right, yeah, why don't you guys give it a try..." I like him and his podcast, but there is a strong flavor of I know it all there. Good luck.
One thing many miss: 'we' usually think of raw sugars/carbs fruit and veg. juices as being cleansing. But in truth Raw proteins, and most likely raw fats, are just as much or more cleansing to a body that has filled itself with damaged proteins. THIS may be too much for him to go into, as he indeed continues to fill himself with damaged proteins from heat (dissonance). Although I doubt he cooks him meat past medium. I can't remember exactly how he likes it,, shared that with Harry.