Apparently it wasn't the fault of the flying pilot (SAA's Chief Pilot). The French pilot who was flying as the co-pilot, raised the flaps just as they touched down.
Autothrust is normally engaged (even during manual flight on a Airbus). The autothrust then applied instantaneous thrust to accelerate the aircraft to the new higher minimum flap manoeuvring speed.
The result was, what should have been a small bounce, became an embarrasing one and the aircraft lept into the air again. What was the Airbus French pilot thinking? The French pilot apologised to the Capt. for doing this.