The caveat here is that whether grief activates or not will depend highly on whether IsFrozen() is closer to IsDead() or to IsSleeping() (or IsOnATrip() or something similar implying prolonged period of no-contact) in the synaptic thought infrastructure* and experience processing of any person's brain.

If learning of someone being cryo'd fires off more thoughts and memory-patterns in the brain that are more like those fired off when learning of death than like those fired off when learning of sleep / coma / prolongued absence in a faraway country or something, then people will likely feel grief when learning of someone being cryo'd.

* Am I using these terms correctly? I'm not a neuro-anything expert (or even serious amateur), so I might be using words that point at completely different places than where I want, or have no real common/established meaning.