Some replies are responding to the title as if the author literally meant "living organisms".

Instead, I think it's clear that the author is speaking of an interesting metaphor.

It's similar to how we might talk about all the various Javscript libraries and framework flavor-of-the-month as a sort of "Darwinism" and "natural selection". E.g. it's a marketplace of coding ideas and the ones with staying power demonstrate "survival of the fittest".

Or to write about all the worldwide computers executing high frequency trades on the stock exchanges as an emergent "super-organism".