I have been a PHP developer for more than 10 years. Since a couple of years Python has become my language of choice. I'm addicted to Python, every project I now start is in Python.
But I don't see any real valid reasons in the article to convince people. Do I have a valid reason? Probably not, every project has their own reason to use a specific language.
One valid reason to choose Python instead of PHP: Encoding. Never had any big problems in Python and a lot in PHP. Oh and multithreading.