1. CGC is stupid.
2. That poster is nobody and, if they agree with that nonsense, they are... like CGC.
3. UXM 166 is, unquestionably, 100% Copper.
It's worth noting, it has been considered copper up to this point and still should be, but with the forums now who know. @MattrixAlien at least now you have a defense if you yourself are on the fence. It's in a realm of possibilities as far as the cgc forums, but in life it would be, imo, more separated by decades, with few exceptions
Please yourself kind of thing, but at least know where you stand and why! Haha