The list shows sweet potatos second from the bottom in nutritional value.
Do a search on the nutrition of sweet potato and find it ranks highest in nutritional value.
They are really high in vitamin A (283% of the recommended daily allowance per 100 grams), but the method caps that value at 100% so most of it doesn't count. They're not very high in other nutrients.
Yeah, that’s a pretty selective list of nutrients they’re covering.