I'm guessing you didn't watch the video at all? It was shown in the video what happens when you did it the way you suggested. The wallet fell out of the case and luckily it was still in the pocket.Why wouldn't you turn your iPhone around the other way? With the wallet toward your body? I still won't be getting this but just wondering.
I personally think this is a stupid idea. Think about it, thieves nowadays don't bother with your wallet, they just go for your phone and sell it to someone who will ship it over seas. Now you can lose your phone and wallet at the same time, a bonus for thieves!