If the stall warning sounds all pilots are trained from PPL level to expect it to continue until the stall has been recovered. Stopping the horn while the aircraft is still stalled is dangerously misleading and IMHO is a major contributing factor in this accident.
According to the BEA report, the AOA was indicated at 4 degrees as they went over the top. Since this is the primary driver of the stall warning, the warning would likely have shut off, no matter what the speed was, and even if they didn't disable it a low speed.