Well, it's a goof in the dialogue continuity sense, as the earlier Trek usage has always associated "shuttlebay" with "the room with the space door".
And if we go by that usage, it's a goof in the exterior visual sense, too, there only being one space door on the ship.
But in terms of interiors and story logic, it's a welcome change in terminology, perhaps even a retcon. The Voyager desperately needs more than one shuttlebay, in order to accommodate her own auxiliaries, the Delta Flyer, Neelix' Baxial, and the assorted guest craft.
And we see that the interior has a "bay" structure in that the set (let's ignore its scaling "liberties" for now) shows the space door from inside, and then a kink in the layout so that at least one "bay" juts to the port from the main longitudal space. Quite possibly there are several such "bays", all connecting to the starboard longitudal space (which is then subdivided by wall-like doors between each bay).
Some TARDISing is required to make this all fit, scalewise, but the multi-bay "comb" layout is sound as such.
Timo Saloniemi