Maybe, but there are mammals that can survive deep hibernation and near-total suspension. In pure biological/biochemical terms I don't see any reason to think we're much more than 100 times more complex than a rodent, or 1000 times more complex than the various fish and amphibian species who can survive their bodies reaching near-zero temperatures.

They've put pigs into suspended animation for an hour or two, I'm not sure what the upper bound is on that or how much further it's possible to go with it. Ditto organ deep-cooling. So while it's not feasible now, it feels like we need "only" 100x or so improvement to make it viable.

Everybody forgets about tardigrades, but they will be here when we are long passed from all memory.