This article is nothing more than weakly supported anti-Drupal propaganda. Don't waste your time. It's almost as if an editor asked the writer for a piece to counter all the positive press the switch to Drupal has been getting.
I'm sorry, but I agree with almost everything in this post. Not to start a platform war or anything, but Drupal seems like the best CMS in the world until you figure out that you can do it all in half the time using Wordpress.