Here's the deal. Don't buy it! As simple as that. They have been honest enough to say that a 2000usd cable is not going to make any difference on a DAC that cost below 10,000usd or so. It is for a niche market who are willing to spend that amount.
But that doesn't mean because they are selling a 2000usd cable, their $439 dual ESS Sabre balance DAC cannot be better than an equivalent unknown Chinese DAC.
Honest enough to to make a totally unsubstantiated statement (I I'm not even calling it what it is: a lie) implying that you do need their (snakeoil) usb cable for their 'superior' > $10k DAC. It is for a niche market , meaning rich people? Whats next? Robin Hood stature?
I don't really like the turn we are taking here, but let's please just keep our discussion honest.