The OP made a valid point that he didn't like the Supra CAT8, someone told him it was to do with the shielding, which is correct, CAT8 is not designed as an audio cable anyway. It is a high bandwidth data cable.
The OP favoured a well made CAT 6a cable from Shunyata. That makes sense. It's the right type of cable and Shunyata know how to make good cables. They've been at it for about 20 years from a background of researching cables for military and medical applications, principally power cables.
Whilst materials like silver plating may have an impact on analogue cables, I've never heard any reason why such materials are relevant to data cables. Data cables are all about topology and shielding, not materials, so I have no idea why people like AudioQuest use silver - and charge for it.
Belden are one of the world's leading designers and researchers of commercial cabling and switching. They have revenues of some $2.5 billion annually, that's about 100 times the sales of Linn, one of the UK's leading audio companies. So Belden know about cables, especially data cables. One of their senior designers set up Blue Jeans Cable for well made audio cables at budget prices and they now have a brand called Iconoclast for high end analogue cables. You can spend $2,000 on their analogue cables, but the most expensive 1m ethernet cable cost $16. It's made of Belden bonded pairs in CAT6a, it has a very thin sheath that appears to be heat shrunk to keep the structure intact and each cable is tested and certified. The CAT6 version costs $10 and the CAT5e costs $5.25, but is not made from bonded pairs. They are cheap because the Belden bonded pairs are made in vast quantities to very tight tolerances. I'm not entirely sure what more you want from an audio data cable, which is why I bought three of them, total cost delivered was £47.