I understand where the author of this article is coming from, but his choice of a title for the piece ("Hannah Montana Does Playboy") is pretty tasteless itself and might be worthy of a lawsuit. That is, unless I missed something and she actually is going to pose for Playboy.
The point of the article is that Cyrus is at the top of a downward spiral, and is following in the steps of the trashy women (Spears, Lohan...) who came before. So one of the next steps is Playboy.