He mentions in the article that the interviewees DO write code in his process
I don't think that paragraph and the proceeding one was there when I originally read the post. Seems it's been edited since it was submitted.
See this thread in the comments on the blog (from the author): "The comments here and on Hacker News reminded me I left out a step. I’ve added it." (http://www.aaronsw.com/weblog/hiring#c9)
I just didn't want you two thinking you were crazy or somehow accidentally skipped two paragraphs.