I didn't read your link. So maybe I'm way off-topic. But here at work they make us do these silly safety-training things every month. They're mostly for our construction guys, but they decided to include us engineers to pad the safety numbers for insurance reasons. Anyway, every year, about this time of year, we have a safety-training on heat stress. And, as we all know, you need to drink lots of water when it gets hot out. The lady who used to train us would always say that things like Gatorade (and probably Powerade, too) are actually bad for you, because the "electrolytes" (whatever those are) make you feel full, and you don't want to drink water, anymore.
Obviously, then, either she was wrong (which wouldn't be surprising - she's kinda a ditz), or Keith Jackson and Gatorade are wrong (which wouldn't be surprising - they just want to sell their product).
The end.