Sounds like BS to me. In my experience, a sack of Glock 17s and 19s that one of the IPs in our area had stolen and then stashed in the local sewer/drinking water/canal that had been there for the better part of a week all proved themselves functional after Iraqi maintenance- that is to say, literally slathered in butter or some sort of not-gun-oil, rinsed out, and generally filthy. At least, the IPs using them on the pistol qual range our battalion ran them through didn't seem to have problems.
My Beretta-92, on the other hand....well, it rusted after light rains. Very, very annoying.
I will never trust my life to a gun, because it is a tool. However, if I am ever again in a situation where I rely on my tools to protect my life, a Glock is pretty close to the top of where any pistol can be on that list.
They just work.