From the video I calculated that the aircraft was going 75 kts ground speed in the last 2 seconds. I included yaw in the calculation but not pitch nor slip. Including pitch would increase this speed to approx 88 kts.
Edit: I did the calculation including pitch and we get 84 kts ground speed.
Obviously that's way below stall even after the plane losing approx 1000 ft.
Even if your calculations were right, what exactly are you telling us that we don't already know since hundreds of posts back???