If by "I don't know this guy" you mean Kent Beck then you should google him[1].
This is not some random guy, he is like the "father" of TDD. And that is why the guy that wrote the article thought it noteworthy to mention his quote.
If it came from someone else it would not be that important to make such a fuss about it. But when it comes from Kent Beck then it is worthy at least some discussion.