I wasn't purposely ignoring those issues. The point of the article was to debunk the scalability myth based specifically on performance. I agree that there are a number of distinguishing factors between the two platforms outside of the performance criteria.
On the stateless issue, there are a number of methods for providing background processing for PHP. There are message queues, background process servers, and batch processing just to name a few.
However, that is outside of the scope of the article, which is just about performance.