Be advised that the contact information and even the address they list are apparently fake. So contacting them may be pointless.
In fact it appears the whole point of the site is to try and get you to use the contact form to complain, which then infects your PC.
https://fstoppers.com/news/website-will-steal-your-photos-and-then-hack-your-computer-77511
DO NOT USE THEIR CONTACT FORM. EVEN VISTING THE SITE MAY BE RISKY.
You can’t actually buy a poster or photo from their site, or at least if you try, you’ll send your money and get nothing. They are actually not downloading copies, they do a web search when you look for something and just show the results of that web search.
If possible I would suggest getting the links removed from the thread.
Anyone who did visit the site, and in particular if you used the contact form, I would strongly suggest running an anti-virus scan on your PC.