Its not a new diet by any means, been around for ages. Its really very similar to an Atkins diet.
I think when getting in shape its awesome. You will hold plenty of size and you will get lean and dry. Too long and too strict on it is hard on you and your body. I stayed on a low carb diet for a long time and really like the shape i was able to stay in. It was very easy to stop eating the carbs, it does seem like though that after a while IME your body says "hey enough of this, time to put an end to this nonsense" and it will stop you one way or another. Usually by making you sick and throwing you off track. I have found this will happen to me about 7-9 months on the diet. I ate about 60-100g of carbs a day no cheats, between 3000-4000 cals a day. It was easy once you get into the routine.
For the most part I agree with what you said...except for the Atkins part. There are similarities, I can't argue that, but the difference is the foods being eaten, as well as the amounts.
With Atkins, you're basically allowed any non carb food you want, as much fat as you want...it is a high fat diet based around fats, while the other is more of a moderate fat diet based more equally around protein and quality fats.
Curiosity question...this past show you did, you were eating upwards of 4k cal per day?