Reading through the article it sounds like not a great study, not asking enough questions and not tracking key information, such as cause of death.

Sounds like one of those things where people are going to headline what they want out of it and use it to champion their bias. “Being overweight doesn’t kill you, yay!” Nah, it’s way more complicated than that. People with cancer and other diseases often lose weight, a lot of it, and studies like this don’t do a good job of tracking this info.