How about while reading? Or thinking? It's not like "using a computer" is a monolithic activity. Electric desk frames allow you to change position throughout the day. The latest one I got (3 segment legs from geek desk) can go so low I can sit lotus in front of it.
Yes, changing positions is really the key. That's why I have an Ergotron sit/stand mount for my monitor, and I use it in both modes. I also tend to pace a lot when I don't need to be looking at the monitor. (One of the nice things about working at home is that nobody complains about that.) I'm sure squatting is fine and even good exercise once in a while, but this article is presenting it as a primary position for extended periods and that's just crazy.
