Note the bit of GGP I quoted was around the the insulin hypothesis. That supposed connection between insulin from high GI foods causing weight gain (or reducing weight loss), that is what the studies referenced in the article disprove.

"According to the insulin-carbohydrate model, we should have seen an acceleration in the rate of body fat loss when we cut insulin by 50 percent," Hall said. But they didn’t, which he thinks suggests that the regulation of fat tissue storage in the body has to do with more than just insulin levels and their relationship with the carbs we eat.

The new results also echo a previous study of the insulin-carbohydrate model, where Hall found that people who cut fat in their diets have equal or greater body fat loss than those who cut carbs. (Here’s Hall’s new review of the literature on the carb-insulin model of obesity.)

"These studies represent the first rigorous scientific tests of the carb-insulin model in humans," Hall added. "The public needs to understand that this [insulin-carbohydrate] model now has pretty strong evidence against it."