Organfreak
John is reluctant to discuss 447. He does say the pilots were screwed from the outset, and for many reasons, not the least of which is lack of training, especially re: UAS and high altitude SOPS.
Mach. Who's to say PF did NOT conclude "Hmm.... Spoilers were no help, perhaps FLAP?" The word EXTEND suggests that, at least to me... If, as is possible, all three ended up being worried re: Ospeed, there were discussions re: FLAPS, and prolly GEAR.
In a descent as weird as this one, how is it all are so sure what happened?
Can there be another explanation except that they believed Overspeed?
Never gamble, Organfreak, and try always to keep the houses tiny. Big houses are a problem.