Yes redjeep -I totally agree with you.
If a well trained endurance athlete goes out and run on Water OR an electrolyte drink they will burn a certain percentage of fat and a certain percentage of carbs(glycogen).
If the same athlete goes out and does the same run but drinks a sports drink like body fuel - one containing lots of carbs - they will burn more carbs as there is a ton of sugar floating about in their blood stream.
So, even though the research is correct - it's not the ZERO that causes the extra fat burning - it's the lack of extra carbs.
At least that's how I read it. I think it's a pretty cynical marketing ploy - they should sell it on what it is and what it can actually do rather than making a truthful but misleading claim about fat burning. It's a bit like sticking a sign that says 'Cholestrol free' on a bag of apples.