" I can’t cite a single source that would explain it all." of course i already knew it.
I know the IEEE very well our team has submitted our research manuscripts to them a few times. I can’t really find "digital signal waves are analog". So could you be more specific about the IEEE specs for data transmission in regards to "it's analog"? I will contact the IEEE tomorrow for details.
Don’t waste money (if you’re not elon musk). Just buy on amazon for less than $10. You won’t find any audible difference at all. Those cable sellers buy them on amazon/ebay just like us and decorate them with fancy jacket or some other snake oil