It's misinterpreting the findings that as a snap shot, you take normal BMI person who is extremely sedentary, vs someone who is 20lbs overweight but gets a good 2-3 hours of exercise a week in the 'fat burning zone' heart rate wise. The overweight person is likely going have better cardiovascular conditioning but you are literally comparing skinny untrained to overweight trained so it's a bit like abs on a skinny guy/tits on a fat chick, dunt count. Healthy obese was written off early last year I think, 10 year study, most of the obese who were metabolically healthy at the start, weren't by the 10 year mark for various reasons but I think the main point was that they got tired of outrunning the fork and it skewered their pancreas.