I would suggest those prices have not been updated, otherwise you may be living in false hope. As I've commented before, a brochure is a history book valid only at the time the details were sent to the printers!
The prices of drinks on RCI are no where near what is stated in the latest www.CRUISE.co.uk brochure. I was only reading this yesterday and my wife commented on this very subject. In October last year a bottle of Corona was $7.50, a glass of chardonnay was $8.25 and a whisky and coke for $7.