They knew their descent rate, in the end. Originally "I have no Vertical Speed". You think they knew Attitude? Betcha a buck they did not."
The Captain came in...."What are you doing?" "I don't know, but we are descending".
How do we know? Because with an attitude cue, one of these worthies would suggest Nose Down. Occam, again. Slightly less likely is that the two NF pilots were unaware PF was holding back stick, and assumed he was pushing the stick forward. Poor display, poor cockpit design, poor training, poor CRM, shortsighted SW design, inexplicable Autotrim...... all down to Occam? Hardworking fella, this Occam.....
Repeating the same rhetorical "How could three pilots...bla, bla, bla......."
does not suggest, let alone confirm, there was a reliable attitude display.
How many times did PF correct the ship's Nose Down proclivity? Sufficient to climb to Stall? What attitude was he reading? What was the exact source of the disagreement between the PNF/PF re: altitude?
CVR please.......