No, the tail light thing doesn't change anything. Mine was built without them and was given the $50 credit after the fact. If they have them, they will install them, if they don't they give you a $50 credit. Your dealer can "Place" an order but that doesn't mean anything until the constraints are lifted and they actually have an allocation available that week. If the constraints are lifted and they don't have an allocation, the order will still be pending. If they get an allocation and the constraints are still magically not there, then GM will accept your order and then you are just in a waiting pattern until it gets scheduled to be built. So the wait could take a very long time because no one knows the constraints until they are released each Thursday.