Looks like the aircraft was held in the stall, for over 3 minutes; question is, why?
Fitting an AoA gauge seems like a good idea.
I await more info on whether the AH, VSI, altimeter etc were displaying correctly.
Do you airline types get taught/practise limited panel anymore?
I don't think vast numbers of hours help. My IF1 in the RAF was in wave activity in the Vale of York. Max rate climb selected and going down 1 minute, power off glide and going up the next minute - you just need an excellent instructor (mine was ex-CFS A1).