There appears to be some discrepancy .
Check the revision date of your AFM. If there is more than one reference to the same procedure, you will often notice a difference until they are all aligned. But don't hold your breath waiting.
I have an old copy of QRH (2003) and the G+B SYS LO
PR Summary recommends that you delay the L/G Gravity Extension until you have decelerated to the Calculated VAPP.
In the light of crew and aircraft performance over the years, Airbus has changed some of its recommended procedures.