Also yeah cryogenics doesn't...actually really work, but Senku's idea that it miiiight keep him alive just enough to be petrified and then healed by the way is a solid one. I wonder if it'll work out.
Well.. actually the petrification/reversal effect, is the missing piece to make cryogenics work. At the moment the problem is cell damage from ice crystals.
But since reversing petrification has already shown to bring magical whole-body healing, then thats suddenly not an issue.