Well, the question of how much he weighed when he entered the hospital is kinda important.
Assailing the report because the group that published this is "extreme" doesn't work. LIkewise, assailing a diet because its proponent was obese doesn't work.
What does work is to show that the "extreme" group distorted the facts or that the diet proponent was on the diet, and that was the cause of heart disease and obesity.