This is a possible scenario:
LGCIU 1 fault, GPWS off as per ECAM to prevent spurious 'TOO LOW GEAR' flight continues, LGCIU 2 Fails on final, high workload, gear missed, no GPWS call outs due to being selected off earlier. Aircraft flares, crew notice abnormal attitude etc. Baulk landing, nacelles contact runway. Damage is done to IDG's, both fail on go around, aircraft loses AC1+2 RAT extends, further (currently unknown) damage done to engines on contact with runway results in dual engine failure.
It's an idea based upon the current information