hmmmm dunno here... they are grownups who make their own choices. possible he just shows them extreme methods (they do make VERY good changes, and there are many more clients of his who are healthy).
if you train 5000 Bbers, and 5 of them take ill... sad but so many factors at play, and while it's easy to blame someone, we saw the same thing with other top trainers. They work with the most extreme guys in the most extreme sport.