0/0 I admit it doesn't so on second thoughts and according to the graph, the AP was disengaged at the point of GA and not re-engaged until after the altitude was recovered as indicated in Fig 2, but the A/T remained engaged throughout. Looking at the trim inputs, it can be seen that the aircraft descended at the same time the main trim was commanded APND. This coincides with the increase in airspeed and looks like they may have experienced a somatogravic illusion akin to a pitch up.
Clearly if the crew were using main trim, then they knew the AP was not engaged.