Agreed! G10 is the correct designator for these, (just like any of the Chinese commercial imports, it's stamped on the receiver!!) I've heard them called "long blade Yugos", "commercial Yugos", "chopped M59/66s", "M59s" etc. All ridiculousness! G10 is what we call em here.
"New" and "unissued" could easily be technically correct terms too. I think people saw those on the Widener's ad, then when they got them or read AIMs ad, realized these were rearsenaled and decided they didn't get their money's worth or felt they were lied to. As you said, you can look right at one and realize it's not a true M59, but it is an M59 'type' of gun which both ads claim (kinda sorta).