But whole humans are too big to quickfreeze. The cold just doesn’t travel fast enough through the torso and brain to not cause damage.,

Ok, there’s maybe a workaround. There was some news years ago, about someone that replaced a pigs blood with cold saltwater + glucose to keep them in a stasis and then just pumped the blood back to revive them. That aparently worked up to a few weeks but if you find something that keeps liquid at -100°C or less (and isn’t poisonous)…