The analogy is incorrect though.

There is economies of scale for creating the thing, and then the economies of scale for the thing making electricity.

You can make nuclear reactors smaller under the assumption that you’ll be able to make them faster and cheaper over time. But the cost of the electricity they make goes up versus larger reactors because the costs for parts aren’t linear. An SMR is a basically a tiny plant for making electrify.

A solar panel doesn’t have this issue. Making the panel 2x, 5x, 10x bigger does not change the unit economics of the electricity it produces.