@Machinbird
[If the the aircraft averages ~10 degrees wing down for the duration of the simulation, then it will be flying through a different part of a turbulent air mass, and the assumptions used to develop the effect on the aircraft will diverge from what would have happened in reality as time increases.]
In that of course you are entirely correct, although the major difference I think would come from the different winds at different altitudes. I do think though that there is enough meat in the simulation to show that the aircraft, left to itself, would have stayed safe, which is why, I think, the simulation was attempted.