well the fact is that they did.
https://www.whois.com/whois/z-library.se
seizedservers is apparently a commonly used domain to redirect domain seizures to. https://www.bleepingcomputer.com/news/technology/z-library-ebook-site-domains-seized-by-us-dept-of-justice/.
you can do a whois, which shows that the redirect is to a domain used for domain seizures. you should edit your post, as it is factually incorrect.
https://www.whois.com/whois/zlibrary-bl.se https://www.bleepingcomputer.com/news/technology/z-library-ebook-site-domains-seized-by-us-dept-of-justice/