Given the deviation, what was the reported altitude at 0210:34??
If Prim1 was inop at some stage in the final minutes would the HS "lockout" obtain, given EASA's conclusion that reset involved no Pitch authority, irrespective of 'Load' prot.??? Had the a/c entered a dive at 0210, established descent, then encountered only stab trim to pullout, to find a serious lack of Pitch authority while waiting for reset??? I.E. "0" HS 'set'.
(This may not derive if AD was complied with, unless PRIM1 was inop on launch, MEL). Either way, if PRIM1 was inop and what followed was a second computer trip, this HS lock explains a possible unrecoverable descent, perhaps with parts leaving the airframe closer to 0214:30.