I once spent 9 months on zero carbs. Your body will not stay in ketosis even eating zero carb.
For true ketosis, follow what epileptics use, what Big A has said, what I have said in one of the last keto threads. Things like the palumbo diet are no keto-diets. Way too much protein (and gluconeogenesis) to accomplish that.
I vaguely recall 80 gr protein being the max daily limit and that was with a lot of fat calories as well.
Edit: had my numbers wrong, recommendations are at least 80% of kcals coming from fat.