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If you look closely he reloads the wing back up as he rolls in aileron. As I said unload the wing "AND KEEP IT UNLOADED", stop the yaw with rudder, level the wings with aileron. Simultaneously power is coming in and as airspeed increases to a safe level gently raise the nose being careful not to cause a secondary stall by loading up the wing too much again. Whether I'm doing this in a C172 or an A330, the principal is the same. If you unload the wings they are now unstalled and the wing is flying. At this point ailerons are effective and won't cause a wing drop as long as you keep the wing unloaded. If you reload it up again you get what you see in the video. Text book wrong technique.