Not easy to see, and I have no in depth knowledge of A320 structure, but it appears that the elevator spar is still there on the aircraft, the missing section is the composite skin and core that has detached itself from the spar probably due to dis bonding caused by water ingress and the freeze thaw cycle.
Just an aside but what twisting asymmetric loads might have been imparted on the rear fuselage/stabiliser structure when the aircraft rotated with all the forces being on one side.