After wading through the article's obnoxious style, we see it provides no tangible arguments against standing, nor for squatting. In fact, the only argument against standing is that it's uncomfortable, and then the rest of the article is spent explaining how to make squatting less uncomfortable. Squatting for more than 5 minutes would probably make my knees explode.
When I started squatting, my knees were so weak I couldn't walk up a flight of stairs without pain. I finally started exercising because my doctor gave me a look of disdain, handed me a sheet of basic exercises and told me to get out (edit: when I went to her to ask about my knee pain...)
I'm not going to argue for (or against) working in squatting position, but squats done properly are not going to hurt your knees.