this article is fluff, that exploits Lancaster tourist take on the amish to clickbait into strange and deceptive conclusions.

there are two important points, ordnung is on per community basis, and second point is that the technology is exclusively used to facilitate business. (with the usual disclaimer that ordnung is often violated, for personal sinful reasons, like making personal, superficial calls on business cellphone, or taking business truck on personal trips).

therefore nobody "runs diesel for light" as a substitute for kerosine lamps, unless in gross violation of ordnung. those are not going anywhere. diesel, John deer tractors, ford trucks, cellphones, and now apparently solar panels are used in some communities to make farming work more effective with a smaller numbers in a community. Lancaster might afford to till soil with drafting horses, because they have large resource surplus, but smaller communities often rely on machinery to give them economic advantage.

from this perspective there's nothing special about the solar panels. they are a calculated and controlled addition to an existing roster of technological allowances.