If you think you are anonymous on this site, just press F12 while in your browser. What do you see?
Your network address - now press the network button and you will see more details. You can even see who uses AT&T or Comcast and there is a few from Telus (in Canada)
It is true your network address isn't your name and employee ID, but looking through these posts you can see that it is the same addresses posting most of the messages.
In fact you can see that in many cases, the only person replying to a post is the same person who made the original post.