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Because everyone knows when you do a major heel/face turn to this degree, you have to change up everything to really hammer home he's a different person. A new theme, a new outfit, a new slogan, hell growing a beard or cutting your hair, putting on a suit, etc.
He's done none of that. He comes out to the song he's had as a giga babyface for 15 years. He still wears his babyface clothes. Nothing about him screams heel.