He could have learned this years ago if he'd looked at existing knowledge arond user testing. Who knew, users tend not to give direct negative feedback?
I personally learned some of this in my UX course, but nothing substitutes for experience. As is, the article is seems to be extolling the virtues of keeping good feedback practices in mind (as well as highlighting a rather amusing term, "grinfucked").
It's good though that you can leave negative feedback on a rather open article. Keep up the Ivory Tower routine.
