In vitro fertilisation involves similar cold, used to preserve actual embryos intended to grow up into real life humans. As does freezing sperm. No-one bats an eyelid; I'd suggest because these technologies work pretty well.

Were people similarly nonchalant about it back in the 1970s when the possibility was discussed seriously but there hadn't been even a proof-of-concept trial, not to mention having it as a standard medical procedure?