IMHO it depends whether the Germans correctly identified the failed D day landing as the main invasion attempt. If they mistook it for a decoy, then your point holds. If not they could safely transfer. Even allowing that no new material, fuel, etc would be required (in itself very, very unlikely,) planning landings on that scale takes many months of really good quality staff work. There simply would be no way the allies could be re-organised before the 1944 weather window closed.

In a way, though, holding forces back in France and Norway until towards the end of 1944 in the face of an imagined invasion threat might have turned out to have been even better for the Germans.