exists in the same form until it becomes extinct. He dubbed this lack of change “equilibrium” or “stasis”...

If form (life) implies difference within extincting sameness of flow (inception towards death), then the implied momentum of motion represents the balance (equilibrium) for ones free will of choice, which isn't at standstill (stasis); but at center of surrounding motion.

Ones lack of self discernment about being within the momentum of motion doesn't imply "lack of change"...