Stuff goes off the web, usually when a closed business doesn't pay for the website anymore.
Looks like this website was only active 2003-2005. So they have probably been out of business since late 05 (last archived on 19 Nov. ) It's possible they were gone earlier but the hosting company left their stuff up for a while. it happens, mostly from laziness - why spend time clearing the site off the server as long as there's room?
https://web.archive.org/web/*/www.halloffamegrading.com