You're talking about how higher prices can motivate higher supply. The parent commenter was talking about how higher prices shift the current point on the demand curve to the right. If hard drives sold for $1 billion per gigabyte, we wouldn't see even AI companies buying as many as they are, and current production would go idle. Even assuming supply is locally inelastic (as it is given no time or space to scale, or given a lack of confidence that scaling is wise), you should be able to find a price point that avoids supply shortages by manipulating demand.

Thus far, we've not found that point.