HN39, OK but eventually the AoA went well over and the aircraft stalled. It is inconceivable that somehow the fwd speed got to 60knots unstalled, so at some stage it should have been continuous until the fwd speed did indeed reach 60kts. One can only surmise that knowledge of previous false stall warnings in UAS conditions were somewhere present in their minds but if the plane was flown upto and into a stall wouldn't the warning have been somewhat insistent ? Is there some other condition of validity which would silence it ?