What? You mean here?
Well, those are fairly broad bands "50 g to 100 g" for "effortless weight loss" means the top of the range is twice the bottom. Anyway, this is only one person's opinion at one time - although Mark's opinion is likely to better than most, and may not have changed since he wrote that page. Besides, while people like to focus on "macronutrients", maybe it's more important to make sure you get enough micronutrients (vitamins and minerals).
FWIW, if secret agent boy were eating around 2,600 calories a day, which is average for a fully grown male (unless he's digging ditches all day or something) and that included around 75 g of carbs, then that's going to be around 10 or 12 % of his calorific intake.
As a percentage most people eating in the primal style are probably eating something like 10% to 20% of their calories as carbohydrate. You could go nearer the bottom of that percentage, or even a bit less, if weight loss was a major consideration.