Picked this comment out of the report:
FDR data shows that the aircraft's ailerons and spoilerons mainly were
deflected to the left during the event.
Looks like aeroelasticity might have sabotaged their attempts to level the wings once the speed became excessive. Assuming aeroeleastic effects (wing twist) were in play, they might still have been able to level wings by neutralizing aileron and applying gentle rudder input.