Well, the content wasn’t any great shakes, either. Nothing anyone who hadn’t decided the winner/loser before the thing even happened couldn’t see.
I guess any public figure who hires PR people gets some coaching in body language. Paying too much attention to it would just make Trump look fake - like Hillary, who I’m sure has been ‘coached’ to the skin of her teeth, but still can’t overcome her innate stiffness and insincerity.