Odd headline, didn't see how it matched the story, maybe I missed it. Nevertheless, this is an insightful article about why one should continuously re-evaluate the way they are doing things vs the way things are getting done in the industry.
I think the headline and the blog entry is saying that every line of code is going to be an interface for someone. Whether for the purposes of reading or using your code. Kind of stretching the user interface idea to this other thing, too.