That is an absolutely ludicrous explanation. Nobody is using the iPod app and expecting to get to the store. That short cut is purely there to collect accidental clicks. If I wanted to purchase music, I would have opened the iTunes app.

I have personally hit that button accidentally many times while trying to get back to the albums view and waiting for the animations to finish in exactly the way this article describes. I did not want to go to the iTunes store! I just wanted to pick another album on my phone and now I have to double tap the button and navigate back to the music app.