HundredPercentPlease has explained very well how you fly this approach in an Airbus. It must be obvious even to the non experts that if the crew had flown the approach as per procedure they most likely would not have ended up as they did. We can speculate about weird and wonderful computer failures. Before we fixate on the highly unlikely why don't we revisit the most likely scenario. The crew became distracted by a medical emergency, decided to expedite landing and got behind the aircraft.
If they failed to set the correct MDA and compounded this by not switching to QNH in their focus on landing as quickly as possible they could easily have been below one hundred feet above ground rather than around 400 feet when the minimum autocallout woke them up. As a previous poster has pointed out this is a difficult situation to recover from in a 330. As the aircraft rotated rapidly into the go-around attitude the tail hit the ground hard enough to separate and the rest is history.