Except there is no real background feature that says this. This was expressly introduced as a "would you let this ridiculous background feature in..." As some a strawman to knock down (look how ridiculous your position is). Again no one is ACTUALLY advocating absurd results.
The actual feature is Wanderer:
In addition, you can find food and fresh water for yourself and up to five other people each day, provided that the land offers berries, small game, water, and so forth.
It has its own inherrent limitation and would expressly NOT work in a truly lifeless place.