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. OTOH, in the desert, and in my greenhouse, alkalinity builds up because alkaline metals are applied in the irrigation water, but there's never enough water to rinse them away, or they just rinse into a dry creek and downhill to some other spot in the desert (or the low spots in the greenhouse, where the white is).
Drought areas don't have much to do with alkaline vs. acidic. We're in what would be called a permanent drought area and the soil is very acid.
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