It’s hard to know where to start on that write-up.
I guess the crux is, it’s a digital cable so either what goes in is what comes out, or it isn’t. So the question then becomes, does (regular) Ethernet have sufficient bandwidth to transmit your audio data reliably?
CD quality audio clocks in at about 320Kbps. For lossless audio, you’re in the realms of let’s say 1.5Mbps to be generous. We’ll skip over the fact that most people are unlikely to be able to tell the difference much beyond 320Kbps and just roll with this.
Regular CAT5e is rated to 1000BASE-T; that’s 1000Mbps over 100m. That’s over six hundred times your required data rate for lossless audio.
So can regular Ethernet transmit lossless audio to an acceptable standard? I rather think it can. Hell, shitty old 20th Century 802.11b wireless is 11Mbps, even if you halve that to allow for CSMA/CA overheads you’re still golden.
Conclusion 1: You don’t need a £1600 cable.
Conclusion 2: You don’t need a cable.
Conclusion 3: What a large set of hairy bollocks.