“If you make a copy negative off the print, the print is the original and everything else is a much less valuable COPY.”
Okay. They still sell prints of that image. Are you saying they haven’t made some accommodation for that and are still hand printing every one from the original negative?
If they are selling it as "from the original negative" yes indeed. And the art market notes the difference.
The rest are "collector prints" with no art collector value. That's why the genuine article brings so much at auction.