There was a sign regarding the charge for cold beverages as recently as last week, and the policy was in effect there last season, as well.
I had a similar situation with a bottle of wine there a couple of years ago, from which I actually was the beneficiary. An expensive burgundy was priced very low, but scanned at a considerably higher price. When I showed them the price on the shelf, they gave me the bottle at that price, but immediately changed the tag!