The former Boeing pilot concurs about the flight pattern not remotely fitting an activation of MCAS.
The flight pattern of the accident flights did not remotely fit an activation of MCAS either. The cause of the accidents may be very different than the simulator-experience from the chat (erroneous AoA instead of erroneous simulator coding), but the consequence was similar: an unexpected MCAS activation that clearly startled and surprised Mr. Forkner. And this was a Boeing technical pilot who definitely knew about the existence of MCAS beforehand and did not have to cope with other simultaneous failures and warning modes, such as erroneous airspeed, continuous stickshaker and ultimately GPWS telling him he is flying into the ground.