Technically the Airbus doesn't have a limiting 'G' as such but is more of a rate of descent on impact. An engineer told me that the hard landing report will trigger in our airline at around 2.2g and a full inspection is required in the 2.6-2.8g range. In a previous airline an A321 did a 3.9g landing during a Windshear Go Around and it was deemed uneconomical for repair as it was going to require a new wingspar and tail. I would be very surprised if this aircraft should have flown after a landing than hard. Remember the UK charter A320 that flew home a few years back after a 3.5g landing and on departure the Gear wouldn't come up as the airframe was so distorted. On closer inspection there was rippling of the skin under the wings.