They said magic find, gold find is different
I suppose, but given that the new system adds both MF and GF I have to assume that they want to phase out GF as well.
...except that the item still has additional gold drop chance, and is useful for anyone below Paragon 70 even if we assume a GF cap in addition to the MF cap.
there isn't any assumption when it comes to a gold cap addition to the MF cap, they clearly say in the blog both of them are getting capped at 300