DeFacto
It seems clear that whatever the data has or will show, the a/c was handled as if oversped. Now that is an opinion, but the controls and attitudes were indicative of a mitigating plan against Overspeed.
What caused the climb, what casued the determination of the PF that they were fast, etc.?
There will always be questions unless and until BEA release all the pertinent data.
It is all well and good to pitch calumny at one direction or another, but BEA have all the cards, and they aren't talking.
How complete shall the data be to determine cause and effect? Until a likelihood is established? The climb is not unknown, it is is more like a "trait" than an anomaly. So there it is, the CLIMB. I think it very unwise to trust simplistic solutions, make a "software" improvement, and place one's cranium back in the sand.
"Work in Progress" is not something one likes to see in Aviation.......
There is a bottom line, and it has to do with how folks can deduce a chain of events from a recorder with great accuracy, yet the chain of events itself, in real time, is not privy to this exactitude, and suffers the loss. Perhaps Engineering Pathologists should sit in front.