When was Flight Idle selected ( for a few (10 ?) seconds only )? NOW this is said to be a part of the new joint Boeing/AB Stall recovery for aircraft with their engines mounted under the centre line or wing.
IIRC the pitch of AF447 was reduced during this short period, before TOGA was restored and the pitch went back up and remained up.
( For these brief moments AF447 WAS indeed a " stalled glider", with whatever advantages this might or could mean. Think of AirTrans, which was not stalled as I recall, but did fly as a glider to a safe landing.)
As a stalled glider of course the nose should be lowered, to get the wings working properly as usual. And then power restored to make it an aeroplane.
As has been discussed "STALL" appears not to have been recognised.