I know very little about the A340, or Iberia operating procedures, or Quito airport. But imho one thing sticks out here: the PAPI seems not to follow the same approach path as the ILS glidepath on this runway. So breaking cloud at DH, previously aiming for a displaced threshold, pilot now looking out and the aircraft is 'high' on approach according to PAPI which are now directing the landing onto the real threshold. Can one be surprised that a heavy landing might follow?