Given the diets seem to be largely speculation, my approach seems reasonable to me.
What you need to figure out is what is best for you and your needs because we are all different. Try a week with the rice and a week without the rice. Try a week with the potato and without it. What you will generally see is that these items set you back. As you recover you can add these items in with little or no detriment, but starting out you could be set back in a major way from my experience.
I think the key is to make sure whatever you put in your body has some value. If the food you eat is the same as sugar once it is digested, what good is that doing? Staple foods like rice are cheap. That is why they are popular.
I do not disagree with your method of coming up with the diet. I have read several messages from people using the diet though that say it is just not cutting it. I think you said it well when you said “guideline”. I think people should be encouraged to think for themselves and do their own research and use your diet as a guide to do that. They can use it as a crutch until they can walk on their own (hopefully in very short order). If they use it as their new lifestyle and diet, they are making a big mistake, in my opinion. They need to adapt and change things around for their own purposes and bodies. I do realize not everyone is comfortable doing research and planning their own meals or diets. And for those people, a cookie cutter solution may look very attractive.