This diet seems like a good, moderate version of LowCarb dieting. I myself have done something similar, back when I was working out alot. If this guys book can bring more people into the low-carb way of eating, and if this help those people become healthier individuals, then more power to him!
Of course it is. Atkins preached ketosis for the first twenty-five years of his diet program, though he did back off in the last few years.
Achieving ketosis is not necessary to lose weight on Atkins or any other low-carb diet.