Longstay,
Landing short of the threshold is not acceptable, this aircraft touched in an area available for take-off's but not for landings. The pavement ahead of the displaced threshold may not be of suitable load bearing strength. It is also possible this section was not protected by a full instrument or even a visual runway strip. If the aircraft had unserviceablities, this should have been accounted for by the crew when assessing the Landing Distance Available. If the figures don't add up then you don't land. Can only assume there was a significant unforseen tech problem with the aircraft, otherwise you must conclude this was cock-up!
AeroMANC