Would this A330 have been able to roll out of the stall to gain some pitch authority later on as the stall was broken?
If so, and considering SA parameters would be improved in daylight, you'll understand my earlier thinking about what effect night had on this scenario. The high nose attitude, i.e. seeing only sky, IMHO might have helped them understand where they were and what they were doing and thus hinted to stop doing it. Ultimately they might have sensed what to do and how to do it and appreciated they had lots of air underneath them and where the horizon was. In the dark, and a panic sets in and takes over, that loss if visual sense surely did not help any.