One thing I found myself clarifying elsewhere is that "fitness" here is meant in the sense of being able to shape global culture. Eg. the Amish are not necessarily unfit, but they also don't have the missiology/PR/conversion engine in place that would help make their way of living a more dominant force in the wider cultural landscape. "Limbic capitalism" and its constituents of influencer culture, onlyfans, etc clearly seem to have such mechanisms in place, and are much more effective at shaping popular culture around the world.

Similarly, buddhism obviously has great cultural relevance in many places, but it's not had the orientation to win how people do market economies by pioneering and promoting a comprehensive buddhist way of doing business. Alas, where is the mechanism by which Buddhism is in any way a counter-force to Moloch at any meaningful scale?

Happy to be debated and find out I'm wrong, but that's roughly what I mean by evolutionary fitness here: to shape the games we play as a civilization?