Why does this article have that title and then give no discussion on that point? The whole concept is pretty ridiculous that they have discovered this healthy

Why does this article have that title and then give no discussion on that point? The whole concept is pretty ridiculous that they have discovered this healthy people that must be healthy because they eat corn and run marathons. All indigenous people were relatively free of diseases of civilization pre-contact (which basically includes all of our medical problems) and would appear remarkably healthy if they survived to old age. This is about the only culture that runs marathons.