Shaggy Sheep Driver:
They had all the AIs showing pitch attitude massively high....
Ample time to do an instrument scan and note the excessive nose-up pitch attitude.
Really? What is the source of your (mis)information?
SSD:
When the captain came back onto the flight deck to a scene of chaos and panic, but in plenty of time to recover the situation, why did he miss that massive pitch-up indication?
Probably because there wasn't a massive pitch-up indication. Again, what is the source of your information? Exactly what pitch up attitude are you calling "massive"?
Confusing pitch attitude and angle of attack is a very basic error, especially for a pilot claiming as much experience as yourself.
Many might believe that any of the pilots on AF447 could and should have assessed what was going on from the combination of instrument indications, however your confusion perfectly illustrates some of the issues about assumptions, training, experience etc. They were dealing with it in the air, under pressure, for real, as it happened. You are relaying 'facts' (read assumptions) from the ground, not under pressure, with the benefit of hindsight and years to review the reported facts.