All potatoes naturally contain solanine, which is poisonous in large quantities.
Conclusion
Peeling wild potatoes makes them at least as safe to eat as unpeeled domesticated potatoes of the same size.
Evidence
All potatoes (wild and domestic) have solanine, which is poisonous in large quantities.
Wild potatoes contain poisonous levels of solanine, while domesticated potatoes contain only very small amounts of solanine.
Most of the solanine in potatoes is concentrated in the skin.
Evaluate
We need to prove that peeled wild potatoes are at least as safe to eat as unpeeled domesticated potatoes.
Did the argument ever define some proving mechanism, like ?
No, so the correct answer would need to do that.
When it comes to wild potatoes' dangerous levels of solanine, most of the solanine is found in the skin, so if you've peeled a wild potato, then you've eliminated most of its solanine.
But is the residual amount of solanine in the peeled wild potato still less safe to eat than the small amount of solanine that's in domesticated potatoes?
If domesticated potatoes only have 10g of solanine, whereas wild potatoes have 100g of solanine, peeling a wild potato would mean that there is at most 49g of solanine left, but that could still be more solanine than what's in a domesticated potato, and that could still be a high enough level of solanine to be "dangerous".
Furthermore, who says that "solanine level" is the only metric by which we should be judging whether wild potatoes are at least as safe to eat as domesticated potatoes?
Maybe there are other differences between the two that make wild potatoes less safe to eat.
Goal
The correct answer needs rule out all possible ways that wild potatoes could still be more dangerous to eat (even peeled, their residual solanine is too high / there's some other dangerous ingredient they have that domesticated potatoes lack).
Or it needs to provide us with a rule that we know applies to peeled wild potatoes and outputs language like "at least as safe".