I was under the impression that Area 14 was to have been for an internal airport train that would connect to various sites around the airport complex. It would seem a bit small for a full metro section.
God knows what's going to happen with the proposed metro now.
The current proposal is in huge danger of being shut down as it's just a link from Dublin Airport to the city centre and doesn't link to the national rail network like you get in Amsterdam, Frankfurt, Brussels etc.