I'm amused by the fact that this person doesn't seem to know that chords per se - and the analysis of them - is practically useless because they can and actually do vary from version to version of the same song. The thing that matters is how the chords are related (modes and progressions).
I don't know -- I still thought it was interesting. The author could have spent all kinds of time trying to figure out if certain chords were functioning as substitute dominants and all of that, but then the article would have been so musically technical so as not to appeal to anyone who doesn't have a fairly high-level music theory background.
