I could work from anywhere, but I don't and no WiFi is not my preferred connection mechanism in my house when I am working with NAS for video editing or some of the other work that I do in addition to writing code. The only time I may crack the laptop while in actual bed is if I was sick and on those days I'm not going to be committing a ton of code to any of my projects. The ergonomics would be all wrong.
The killer quote is “Most people I know end up sitting on the sofa, and half the time the TV is on when they’re working.” I could not concentrate in such an environment. Even if TV may be on upstairs but I have privacy in my office in the basement. On balance this article does a disservice and gives ammunition to organizations whose bosses want to point and show "see, this is why we need our employees to come into the office".