I don’t have a problem with the numbers but the conclusion is questionable.

Moderately overweight people in our society are more cautious than the collection of skinny people. They actually support/take care of themselves better than most, but not by any means, all skinny people. This is easy to observe. Doesn’t make being fat better. The real fatties are just as self destructive as the most crazy/reckless of the skinny people.

Perhaps the best case scenario is to be more fit and also be habitually reasonably cautious, with, work,money,sex, diet,meds,adrenaline, moods, exercise, sleep, coffee, cigarettes, alcohol etc.
Being pretty good with all this and moderately overweight is probably a more frequent occurrence.