Read the CVR breakdown.
The comments and such indicate lack of situational awareness not lack of hand flying skills. FO tried to correct, left seater took over, he comments that he can't figure it out, and by this time the captain, probably with his head in the middle comments he can't figure it out either.
Honestly I can't believe no one else is seeing this...but if there was a loss altitude from FL3700 to sea level...someone would be reading off a VSI and decreasing altitudes...nope...comments indicate that the only indication of an impending crash was the Ground prox (pull up pull up).
If I were to guess, and it's just that...lighting strike took out their avionics and fly by wire. AP disconnects as it's not getting reliable information...from where you say? The computer...pilots are now handflying bland tubes, maybe rebooting...they have not attitude indication, much less AS or alt...
Anyone here with Airbus experience flown the standby gyro with no AS or Alt?