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I would expect a 50% increase in yield change like this to lead to no academic paper, but instead rapid rapid black market distribution around the world, while someone gets rich to the tune of billions of dollars...

The fact they wrote an academic paper instead tells me it probably has some big downside...

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Or very limited upside, potatoes yield is already high enough to remove a lot of nutrients from the soil. The limiting factor may not be plant yield at all but access to nutrients or water.

Maybe its 50% more carbs, without any more iron or potasium uptake.

I've got a feeling that, provided the minerals you care about are in the soil, it would be pretty straightforward to selectively breed to get more of them into the leaves, probably with a small yield penalty.

I think just nobody who farms these crops directly cares about these minerals because that isn't what earns them more on the rice exchange.

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