Keep in mind that while all Shuttle flights are on MD
-88s now, not all of them have been configured to a Shuttle configuration, meaning that some planes are flying Shuttle routes with a F cabin and regular Y cabin, not an all-Y 36" pitch cabin.
This route is using a Shuttle aircraft, potentially one with F seats still...it's just being sold as all-Y. It's kind of like the 764s going across the Pond this upcoming summer, or AA
's 757s across the Pond - every seat receives Y service, even the F seats. The only perk of those seats is the larger seat...you won't be getting a more personal F-style service. One of the perks of being Medallion is that these seats are reserved for Medallions only, kinda like there are seats reserved at the front of every DL
aircraft that only Medallions can select - while service is the same, it isn't really fair that non-elites would be able to get to sit in the best seats of the plane at the time of booking...it's a way to reward Delta's loyal flyers.