[quote=@Dyelli Beybi]
[@Expendable]

How far back do you want this character to be from?  Also they aren't using nanites for healing in the setting (not that that essentially changes anything).  The only ones they have are the translator ones and nobody knows how they work.
[/quote]

Let's make the asset pre-contact. After they were recovered by their parent agency, it was decided to put them in storage with other frozen assets in a high security orbital lab - it wasn't adversely affected by power outages on the surface. When the refugee ships left, the lab got raided for fuel by the refugees and they wound up bringing a few of the assets with them, mistaking them for fuel containers. Or perhaps they brought them along as a hedge to ensure genetic diversity.

It's the same nanites, the translator nanites were build on top of an existing design - this happens a lot in electronics, being easier to modify than to start from scratch. But because they're labeled "translator nanites" nobody uses them for the treatment of brain trauma. The people doing the reanimation aren't aware what the nanites are doing, they're just injecting them so the revived can understand them.

As a suggestion - when people go into cryogenic suspension, it feels like they're being boiled alive because of paradoxical undressing - constriction of blood vessels on the surface, etc. Oddly enough, that memory is lost on revival, and they think they're sweating because of the rewarming process.