Having a futuristic, nonexistent technology which can reliably, reversibly, demonstrably execute suspended animation, is not the same as the realization that mere modern-day liquid nitrogen works to preserve brain state right now and future tech can grab it later.
what about from science fiction? star trek: TOS. kirk meets kahn. kahn has been on ice. many other star trek episodes. see also nancy’s comment.
Having a futuristic, nonexistent technology which can reliably, reversibly, demonstrably execute suspended animation, is not the same as the realization that mere modern-day liquid nitrogen works to preserve brain state right now and future tech can grab it later.