That's a loophole that can be used indeed, but keep in mind zero calorie products actually do exist. As in, they have zero calories at all.
Frequently these artificial juice packets are truly zero calories because they can be made with a simple acid, some food coloring and an artificial sweetener that can't be absorbed or digested by your body.
Such a product does have calories in the physical sense (you could combust them) but they have zero calories from a physiological sense.
I believe you might want to double check your phone and/or headphones. Or even the Deck itself.
I use it daily and apart from the expected latency, the audio is great with no flaws. No interruptions or jank.
Bluetooth 4.0 is capable of handling around 8 connections simultaneously