>Potatoes are rich in nutrients especially if you eat them whole. They are also rich in fiber and starch as a complex carbohydrate takes a long time to be broken into glucose and therefore is not prone to spiking glucose.

Generally speaking, yes absolutely. What happens in a case like this article, though? Is the 50% increase in biomass matched by an increase in nutrient uptake from the soil/growth medium? What are the chances these bigger potatoes are actually less nutrient dense?