What a horrible idea, that's not food, it's just stuff to put in your mouth. Why not just...mix a cake! It takes me about ten minutes to knock up a sponge mix, cook for half an hour. Lovely.
Actually, you've said exactly what I first thought when I saw this, ('putting it in your mouth'). I can easily envision some people simply dispensing the nozzle right into their mouths not unlike how they will eat whipped cream out of a can. Ugh!