What do you mean by a craftsman who can't starve to death?

It means that artisans are different from farmers. Farmers depend on the weather for food, and craftsmen rely on technology. Nothing can starve craftsmen like drought or flood.

Add: "Heavenly Dry" has no special meaning, you think too much. This sentence is just a popular one among the people, that is, you have a skill in your hand, and no matter how bad the weather is, you won't starve to death, because you live by craft.