> the prosperity afforded by abundant energy is a problem they're supposed to be solving.

What does this mean? Did you misplace a word somewhere? Why would prosperity be a problem?

The way I read it is that the amount of energy available for direct use translates directly to the quality of life. The more energy they have, the more they can do with it. Plus if it’s clean and readily available. Instead of being world’s factory for garbage, or figuring out how to invade Taiwan, figure out how to supply clean, “reasonably cheap” nuclear energy.

Any nation with effectively unlimited energy will develop directed energy weaponry.

> Why would prosperity be a problem?

Excellent question.

... I feel like I'm missing something here.

Western elites have been pushing degrowth policies for the last decade or so. GP’s precise intent is unclear, but is probably suggesting there is a hidden, sinister purpose to it.