OC, No apology needed since you have clarified your intent.
I agree with your assessment of their training readiness for the events of that night.
They were not ready, that is plain.
If you will observe the roll PIO video that Organfreak posted. Once the initial overcontrol input was made, there was no way to promptly stop the oscillation. In fact what finally appears to have stopped the oscillation was likely intervention by the other crew member, probably by freezing the yoke in roll, but it is also possible that PF changed his strategy. It is hard to promptly undo this type of overcontrol mistake. That energy has to be dissipated.
I think something comparable happened on AF447. Those big spoilers popping up alternately are able to generate a lot of roll momentum quickly. But on the FBW 'Bus, PNF cannot freeze the stick, he must take the initiative and take control.