Actually, it fits 2009 timeline very well, because it's on iTunes in 720p only while the rest of the documentary is in 1080p.
So it might be the clue for the time when 1080p wasn't everywhere and 720p was the standard for "HD". Seems plausible.
But, I guess, the real reason why we are so confused with this and discuss this is because Mark's music is timeless!