Being overweight or even mildly obese, as measured by body mass index, doesn’t make you more likely to die than a person of normal weight.

There’s a huge problem with the analysis right there. They used BMI to determine whether a person is of normal weight or not. BMI is totally useless. Quite laughably, it doesn’t even account for gender. Let alone bone structure or muscularity. I’m not sure why anyone uses BMI for anything.