What I believe the report doesn't say is what the PF instruments were saying.
In the BEA BAC 111 incident in the 70s the crew had both overspeed and stall warnings at the same time - caused by ice in the pitot and static lines.
There was somewhere over Asia a pitot ice problem just after the AF with prang similar instrument indications to the 111.
I read the post from the crew on PPrune.
The skipper stated that if it had been at night they might not have got away with it.
Speaking from my own experience only - If the choice was overspeed or stall then I would lean towards stalling as with a gross overspeed one has no chance to recover.
On early jets - 707 etc - with an overspeed you opened the airbrakes immediately - did it once in wave over the alps after returning from the call of nature and not realizing the ball park had changed.
Assuming there was not a flight control system fault then it seems as though PF didn't understand what was going on.
Which leads to a post I made last week - why don't they fit AOA instruments?
Lost my best friend in a stall which was not identified nearly 40 years ago and eff all appears to have changed.