Idk, doesn't seem that damning to me considering that people who have more body fat might tend to consume more artificial sweetener and other such factors.
Don't have the time to look into the particular paper and other research right now though.
The basic and essentially unavoidable problem with artificial sweeteners is that tasting sweet food triggers the release of insulin, which then tanks your blood sugar level because you didn't eat any actual sugar, which then makes you hungry, causing you to eat more.
The best way to try and compensate for that is to pair artificial sweeteners with complex carbohydrates and large amounts of fiber, which is of course not how they are usually used
It isn't an energy drink, because it doesn't have caffeineor sugar. The producer calls it a "hydration drink" which I suppose is somehow different from a "drink".