Was this video done in a B737MAX simulator? If so, who's simulator, and if not, we need to know how an NG simulator re-produces MCAS behaviour such that the demonstration is a valid one.
It is an NG simulator. You could fake it by throwing in a bad AOA/stick shaker/unreliable airspeed and then introduce a runaway stab after flap retraction. Not what I would call "valid" but "illustrative."