Mind you airbus, unlike boeing, is written by lawyers not pilots and not for pilots.
Nice try, but wrong of course. It is the same for both and boeing manuals are written by lawyers for quite some now. Added to that the first edition is always produced by those that want the same procedure for the whole fleet without any need for differentiation between very different types.
The relevant QRH chapter is called "inflight performance", at least in our 737 QRH.