This comment thread seems more valid than the article itself.
"Jevon's Paradox is that efficiency leads to use, not "spend more on what is more productive". Your description is just wrong. In Jevon's Paradox the classic example is when the cost of a unit of energy falls, the aggregate energy use grows. It is not "Things that are more productive are more expensive"
The underlying phenomenon you are grasping for is much simpler to understand - when more wealth enters a system, it forces prices up. As a result some services disappear (trying finding a sewing machine repair shop) and some get more expensive, because those people are competing for the same necessities, housing, food, medical, as the people with excess wealth."
https://www.a16z.news/p/why-ac-is-cheap-but-ac-repair-is/comment/173530109