They are not. The site belongs to Jamie Zawinski, who is commonly referred to as jwz. Zawinski is a well-known programmer (known for free software contributions) and current owner of the DNA Lounge.
After visiting the site it no longer redirects to the image.
You can inspect the network request your browser is making to see what it's setting the referrer to.
Why it uses certain values is a combination of your browser's code and the w3c standards, which you may look at if your browser's one of the reasonable open source ones.