I did read the quote however since the r3xx is the generic dx9 then optimizing it = optimizing the r3xx path since it is the r3xx path, names are irrelevant. I just found it funny. One could call the nv35 mixed mode and optimization on the dx9 path too, but since the r3x doesn't use it it is called the nv3x optimized path. Similarly since the nv3x doesn't use the dx9 path and only the r3x does.. anyway I assume you are smart enough to grasp what I am saying w/o further elaborations.
Of course the refutation is that the NV3x can run the dx9 path but the r3x cannot run the nv3x path and therefore the r3x path is truly generic and so forth, whereas the nv3x path is specific.
I will only say to this that is a vendor uses dx9 functionality which favors one card (which all of it will since nv3x sucks), and writes the regular path and optimizes it for the r3x then it might as well be called the r3x path and not the dx9 path but names are reletively meaningless.