Well as it turns out the person I spoke to needs to go back to brush up on the facts of the Epic....and the Studio Cabnis.
Apparently the Studio Cabins have their own corridor which is accesible only by going thru a door that you have to swipe your cabin door key.
So no one who does not have a cabin in that section can walk in the corridor.
Now this ia a manual door and you have to pull/push it open, so if you are using a cane, crutches, walker, scooter, wheelchair it could be difficult to maneuver ones way thru this door.
Why it is not automated is beyond me....I cannot see it being very safe .
Not really user friendly maybe NCL will look into this and have the doors altered to be easier.