Those 30 million people were reclassified from normal to overweight. People with BMIs between 30 and 31.9 would've been reclassified from overweight to obese,

Those 30 million people were reclassified from normal to overweight. People with BMIs between 30 and 31.9 would've been reclassified from overweight to obese, but I see no indication that there were 30 million of them.