I assume a lot of the machinery itself does run on some flavor of Linux (or maybe even some real-time operating system like VxWorks) that has been stripped down for embedded use, Windows just wouldn't run on this kind of hardware. I imagine this desktop is (as you can kind of see in the photo) just a display that sits in an office and serves as an overview of the machines, display warnings, and all that kind of stuff. Though, since it seems to just be a website, I'm not sure why they also wouldn't use Linux in this scenario either and set it up in a POS (point-of-sale) fashion where all it can do is display that website and nothing else. Maybe they also use them for general office work as well? Who knows.