I assume that most of the posters on that site have never heard a high-end DAC and are fearful they will get "taken" if they buy one. All based on the "knowledge" of all the other sheep who have also never heard a high-end DAC, but insist that they know how they will sound based on measurements that one person posts.
It reminds me a lot of the "fans" group on Facebook for our local football team who all profess to know more than the coach and general manager, even though many of them appear to live in their parent's basements and can barely spell.
What's interesting is that Amir purports to also listen to items he measures, yet his listening impressions rarely line up with mine when I have also heard the item being reviewed. Confirmation bias? "It measures like this, so it should sound like that" and voila, it does!