The article and the person would have more "audiophile' credibility if he didn't tout iTunes ripping as the best thing since sliced bread. Even with error correction iTunes rips fail AccurateRip (the only source to verify ripped audio CDs are 100% accurate and error free).
OT - dBpoweramp, Exact Audio Copy for Windows, and XLD for MAC are the only recommended tools for "accurate" CD ripping. The rest will fail AccurateRip and anyone claiming to hear such files and then claiming that they sound as good as anything played on $100,000 equipment... well you just know where they are coming from.
I love the Pi, I even recommend folks use it over Auralic, Aurender, and others of similar ilk, but claiming every $35-$50 DAC with the Pi is the same as any other DAC is hyperbole for the anti-audiophiliac.