I haven't read that but I lost 28 lbs the first month going primal from nasty SAD and I'm sure most was water weight from SAD and inflammation. Weight loss slowed after that. I took a 6 week break from primal then went back and I'm down 40lbs so far.
So you will probably see this taper off at some point. Though I understand it can be faster and easier for a good portion of men vs. women especially menopausal women such as I am.