You still don't get it, do you? You just mentioned Pilot Flying actions. You have no idea of how a multi crew complex aircraft is flown...
Touched a nerve there? Just relax. Am not going to go into credentials.
Multi Crew Aircraft are never flown in dual input mode, being it yoke or stick. Never.
If the PM understood what situation they were in, he should either have told the PF what to do in clear words, or announce that he has control and then do it himself. Both never happened. Because he seemed to never have understood.
It would have been a problem as much on a yoke aircraft, if the PM doesn't realise what is going on and lets the PF pull double-digit pitch values. It is pure speculation that the slight forward stick of the PM would have transformed into nose down commands on a yoke aircraft with a (possibly panicked) PF putting full backward force on it.
The big elephant in the room is basics, and not even in the sense of skills, but in the sense of knowledge how a wing works and has to be treated.