A lot of this article is plain stupid. Case in point:
rather than do the pec-deck do incline push ups? These are different exercises that work slightly different parts of your chest. Why not recommend free wieght flys? Or does the author not like those either?
I can, however, personally attest to the danger of doing a Seated Military Press machine. If the machine isn't set right, you can injure yourself (I did, when I was starting off on the machine). To avoid that, I just use a bench and free weights which allows me to control my own range of motion.
Additionally, I thought the body-builder's dogma should be to isolate muscle-groups (with certain exceptions) rather than use your whole body to "help out." But the article says that when doing military press you should use your hips. I dunno, maybe I'm thinking about this wrong.