Aside from not being good for the bees, there are a bunch of other problems I can think of, even assuming the whole thing isn't another crowdfunding scam (a la hoverboards and solar roadways) and works as advertised.
1. The system can't be cheap.
2. There's no way it can drain all the honey from the hive. I'd be extremely surprised if it got even 50%. Most of the honey is going to remain in the comb and stick to the tubes. There's no way you could flush that out without ruining the honey.
3. Commercial honey extraction involves multiple centrifuging and filtering steps to get a nice clear consistency. Crystal-clear honey on tap sounds dubious.
4. What happens to the hive after extraction? Bees produce honey cells and cap them with wax. This system apparently drains the honey from behind, without uncapping. Great, but then you're left with a bunch of half-full combs that the bees won't touch again. Seems like you'd have to remove the combs from the hive and uncap 'the old-fashioned way' anyway if you want the bees to keep producing.
I can't imagine this system being useful for anything other than small-scale, one-off, hobbyist honey production. And, again, that's assuming it works as advertised.