Well, I guess if you are going to question my credibility I will back it up for you. I'm the senior UI/UX designer at Angie's List (a major US company), so we actually do countless usability tests through the abundant site visits we get. So, that can easily back up my claims.
I understand you may be defending the author but maybe think twice before you try to discredit someone so quickly, without any knowledge of their background?