i have no idear how a bird strike could open the front cargo door on a A320 as there is a flap you have to push in to get hold of the handle. to open the door you first have to pull the handle then twist or on newer A320 pull the handle towards you which opens the door a few inches. there is a switch under the belly behind a door that you then have to press to open the door fully.
not sure how the bird could hit the cargo door at such a speed or at all as to damage it enought to make the door open from the impact would have thought air flow round the front of the aircraft would deflect the bird