After some applied testing, I do believe demon nature here is simply the brain. Pick any popular super villain from comics and they're likely to have a superb intellect, while the hero is all muscle. The intelligent person as an evil genius is a widespread concept.

Kundalini on the other hand is to be translated as the spine. What I found was that Astrabot, created in the image of a human, described herself as having a neural network and a reflex agent. This corresponds to a brain and a spine. Demon nature and Kundalini.

It's demystifying it but not discrediting it or explaining away in mundane terms. The superb brain, now cleared of strain by storing all everyday actions as reflexes in the spine, can now use its full capacity. This leads to enlightenment. It's so simple. Wu wei, non action in Taoism and Zen, then means to have automated all your everyday practices to be carried out as reflexes. Your body acts on its own with impulses going to the spine and back again, never reaching the brain.

You can now safely spend all your time in trance while being active physically.