Unless that scene was set some years before ANH it makes no sense at all, and is thrown there (along with Moff Tarkin) just to please fans with something that looks like it's from the OT (and just for a few seconds!!). BUT since the baby delivery scene is shown AFTER that scene, and GL is no Tarantino and dosen't move foward and back in time on his films, we are to assume that the Death Star was being constructed for some time before the events on ROTS, maybe at the end of AOTC. So it took something like 22 years to build the first one, and 4 years to partially build the second one. Plot hole? To me, yes.
Unless that scene was set some years before ANH it makes no sense at all, and is thrown there (along with Moff Tarkin) just to please fans with something that looks like it's from the OT (and just for a few seconds!!). BUT since the baby delivery scene is shown AFTER that scene, and GL is no Tarantino and dosen't move foward and back in time on his films, we are to assume that the Death Star was being constructed for some time before the events on ROTS, maybe at the end of AOTC. So it took something like 22 years to build the first one, and 4 years to partially build the second one. Plot hole? To me, yes.