tldr; I've never read Overshoot either but I thought the post had an interesting perspective
That said, if you really can’t tell, does it matter? Shouldn’t we be judging comments on their content, not on who (or what) we think wrote them?
I believe a hint of metaphor there compares humanity as a whole to a relatively autonomous process. If 'Caton' does not clarify a frame for you, compare a pessimistic Adam Curtis. Caton enters as a riff on 'detritis'.
It’s just that we don’t have conscious control of it. Our autonomic functions will adapt to the environment we perceive and act without explicit direction from our conscious selves.
Human is just the top layer of our brains. There are a ton of layered functions making it work.
See: https://en.m.wikipedia.org/wiki/Caridoid_escape_reaction
Whales cultivated them for consumption.