I have taught aerobatics a lot as a civilian and have done hundreds of hammerhead stalls which requires a 90 degree pitch attitude but still isn't a stall when airspeed approaches zero because the angle of attack is also about zero. The rudder over in the vertical dive allows you to recover with no stall. AOA as we all know is the angle between the aircraft attitude and angle of flight. Level flight means pitch attitude is the same as AOA because the angle of flight is level. Turbulence may change angle of attack but the same rules apply. When AF was in their steep descent angle after their full stall they needed to reference their attitude to the steep descent path to recover but they didn't know how.
Automation has decayed basic piloting skills the last decade and it looks like this is the future unfortunately.