who is flying the plane?
The pilot or some kind of software?
It should be the pilot, who is being assisted by the automatics. However some people are over reliant on the automation or do not fully understand it. Automation is a good servant but a bad master, getting behind with the aircraft and then having it behave in a manner which you do not expect or understand is a recipe for trouble.
With what occurred in this crash the range of possible errors is much wider than usual, and theories which would normally go on the back burner and only be looked at once the obvious ones have been ruled out, can't easily be discounted.
Gliding in from way too high with the engines back at idle, followed by a sudden application of climb power by the A/T once the speed drops below 250 kts could be an additional factor in further de-stabilising an approach which was already well out of limits. Given the known excess speed, the drop below 250 kts would have happened relatively close to the airport and at low altitude.