Hi Takata,
Prior to the BEA Note, I had used the "until slats extension", but as you have suggested there were other issues in this descent.
busTRE,
I agree that I may be "pushing the boundaries" on this one, but Airbus had determined in their wisdom that the vertical stabilizer needed protection from rudder inputs, and the computers are programmed to provide that as per the graph. I accept that it is not directly "g" related but in all other respects is designed to protect the aircraft.