All they had to do was push up the power when they saw the boundary fence coming up. Even after they struggled to get airborne all they had to do was push up the power to avoid going over houses at an altitude of bare meters. All they had to do was push up the power to avoid flying at the lowest altitude possible to gain airspeed.
Maybe you see a trend here? If you’re struggling for airspeed and altitude the first thing you do is get the maximum thrust you can from the engines. Since the lack of power for the takeoff was directly related to their erroneous weight calculations and since takeoff thrust is computed on weight, altitude of the airport, runway length and other considerations they had plenty of excess thrust to call on. They didn’t.
So I hear AirBus is a fly-by-wire airplane. And every pilot input is filtered by the flight management computer. Wonder if the incorrect mass was applied to every action they took?
A competent pilot should have noticed their airspeed was inadequate WAY before the boundary fence. A competent and alert pilot should have noticed inadequate airspeed before the plane covered a quarter of the runway and either hit max throttle or abort takeoff before reaching a critical point.