Mitch2,
Thanks for passing along this wire information. I'm not an engineer, but a musician who left that trade a long time ago to pursue a different profession. My wife is a classical guitarist who also left that profession to pursue another profession. I think we both have good ears and like most musicians we are extremely familiar with a plethora of instruments and how they sound in a variety of venues live, both on stage and in the audience; but I have a bone to pick, or quibble if you will. You state: "Regarding the price, of course it is a tremendous bargain. More will probably try it because of the low entry price. However, I suspect many here are listening in more absolute terms and will end up with whatever wire they enjoy most, regardles of which is lower priced. My WE wires continue to remain in my main system, at least for now."
To my mind in my "absolute world" yes, I will end up using whatever wire I enjoy the most regardless of price. That does not mean however, that the wire I use will be based on some "cable savvy audiophiles" opinion. The view that ETP copper is "clearly inferior" for "audio/sonic" purposes" to other types of copper you mentioned is clearly inferior thinking on the part of those authors. The proof is always in the taste of the pudding, not the measurement or ingredients in it. It either tastes good, better, best, or worse to the subjective taster. Same for sound. It either sounds good, better, best, or worse to the subjective listener. Regardless of measurement or ingredients.
The WE16ga/Belden 8402 sounds more real and musical to me than products made from the stuff you listed above. So, to me in an "audio/sonic" sense they are inferior to me as musician/listener/audiophile. To Yazaki-san, an esteemed engineer/audio designer/builder/mod person who has vast experience with the biggest Japan audio company's as leader, Jeff Day, reviewer/audiophile and many of his colleagues pick WE/Belden over or at least equal to the likes of Sablon/Revive and many other brands of top-notch wires, silver or copper made from your above list.
Audiophiles have bought in with their $$$$$ to many follies. Look around. Ask your audio buddies: how many big $$$$$ mistakes, wrong turns have you taken in this hobby? This WE plays with the big boys. So does the Belden; and let me be clear, there is no "absolute best."