I think this is just an error in logic. Leaching eventually causes acidity, but the lack of it does not necessarily cause alkalinity. You can readily observe in a limestone cavern how the ground water has been leaching calcium from the surface and redepositing it deep underground.
The sources of stable alkalinity as the column I and II metals: sodium, potassium, calcium, and magnesium. For instance, many areas in Europe have a thick layer of limestone from ancient deposits of seashells. The volcanic regions that you and I live in don't have that. Unfortunately that's why our area isn't going to become the next France, agriculturally. So that's a second way that a soil becomes acidic, simply by being born without any of these metals to start with.
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