It's not the issue of losing WEIGHT, it's the issue of losing FAT........to lose FAT on a CKD, u need to be in ketosis, for that is the requirement of the diet. If you aren't, and are on sub-maintenance calories not reaching your ketosis and falling short, you run the risk of burning lean muslce mass as well as fatty tissue. You'll "lose weight", yes, but that doesn't mean you'll lose fat!
~SC~