Will we ever know what really happened??
YES. We do know what happened. The airworthy A330 airplane was flown into a CB with supercooled water in it. The SC water froze over the 3 pitot tubes simultaneously, causing a loss of critical systems. The surprised crew (who were also dealing with numerous fault warnings and turbulence) inadvertently mishandled the controls causing a high altitude stall from which they did not recover. Simple. I don't see why so many will not or cannot understand that.