It points out the vast discrepancy between what Google recommends people do and what they actually do, suggesting that they are either ignorant of best practices, or are lying about best practices.
The short comment was indeed lacking of usefulness but this one makes sense, talking about discrepancy between what they recommend and what they do for example: "Let Users Explore Before They Commit", I never asked for a Google Plus account, I opened my Gmail and "free gift for you" a G+ account and we will set many actions, shares and notifications ON by default so we can improve our network metrics. This definitely goes against letting me explore before committing.