It is not to say that 737 Max pilots don’t know how to disconnect the trim. It is NOT a new procedure, and has been around since the NG.(maybe longer)
Time, to stop a trim issue, is not your friend when all the other issues are taking place at the same time. Even worse that the reason for MCAS is during higher AOA, when the engine nacelles on the Max are producing lift, which would be more prevalent during takeoff and arrival.(slower speeds, but still in a clean config)
Here are 2 links to some interesting reading, imo
1.
https://leehamnews.com/2018/11/14/bo...to-the-pilots/
2.
https://leehamnews.com/2018/11/07/bo...-air-accident/