The current consensus is that any water deposited by a meteorite will be vaporized and lost unless it happens to end up in a "cold trap" permanently shadowed ar

The current consensus is that any water deposited by a meteorite will be vaporized and lost unless it happens to end up in a "cold trap" permanently shadowed area. What you described is close to what happens when a meteorite with water hits the surface -water is dispersed and whatever water molecules randomly end up in a cold trap stay there. Evidence of water in sunlit areas as in the article is new and it's thought that it is trapped in glass, so I think it's a separate mechanism and water escaping from inside of glass, being evaporated and then also ending up in a cold trap must be very unlikely.