I like the idea of this plan getting you into ketosis, and the OP's general idea of helping people with weight loss, but reading the OP's post, I find a couple of things that dont rest well with me. First off, you do need carbs, your body chooses this as its primary fuel source because it is most readily available to muscles and brain--the idea stated that you dont need carbs is silly. Living in fear of carbs is insane. The wrong types of carbs should be avoided (the usual sugary desserts) but you will lose more weight eating small amounts of healthy carbs (oatmeal, brocolli, brown rice) than you would just sitting around pouding protein and fat. Why is the case? Because those miniscule carbs help you get through your daily workouts. I've been a CSCS certified trainer for years and I see tons of people lose weight.

Also, I'd like to add that if you actually do exercise during the 3 days of eating no carbs you will get to ketosis very fast, I used to hit it during the second day.