Maybe he possesses a super-breatharian power that can see what nutrition lab chemists can't? He could probably make another fortune telling nutrition data-ists the content of foods without actually testing it.
Who knows, maybe he really can. But seriously, that diet would make my whole body ache so bad. The last time I had ice cream and cake was at a kid's birthday party, and an hour later my body was screaming for some salad and I had pains all over my body. I don't think McDonald's would be much different. My friends who aren't 100% raw vegan like me, eat fast food on occasion, and always regret it afterwards. I think growing up on fast food was a major part of my constipation problems as a kid and the reason I have hemorrhoids today.
I actually would do it for like $50 just to see for myself, but if you want to try it, good luck and let us know if you truly feel as fantastic as he says you will.