You're right that DCR says the 920XT has a barometric altimeter. I just looked it up on Garmin's site and they say the same thing.

I can't remember exactly where, but (from memory here so I could be wrong) they also say a barometer is one of the features that separates the Fenix 3 from the 920XT. A coworker of mine has a 920, I asked him to show me the barometer and he didn't know "what that is." I'm more confused now than I was when I left the house this morning.