They are unfortunately mixing up the messages there. It's one thing to fight the shame associated with body appearance (this should be the real fight), and another thing to claim BMI has no significance on health risks (which is what often the argument boils down). There are people comfortable with smoking, there are people comfortable with their weight too, I just hope both know the increased risks to which they are exposed. However shaming the one or the other is just disgusting, especially when it appeals to a "tradition".