Earlier quoted context omitted.
What if that's mixing cause and effect? If you have energy, you have refrigeration. You have the manufacturing properties to produce the things necessary for children to focus on education. You have the agricultural properties to increase yield and reduce the number of people needed for the agricultural sector, making education more valuable.
Educated societies existed before refrigeration and manufacturing so those aren’t prerequisites. The real prerequisite is an ‘educated society’ so there’s a bit of a bootstrapping/chicken/egg problem which is super difficult to solve.
What changed is the incentives and relative ease of different ways of cooling