Welp, you didn't find it.
Website and forum devoted to "furry criticism" Vivisector has been unreachable since late June. As of the time of this article's writing, no one involved with maintaining the site has made a public announcement explaining why the site is unreachable, or even acknowledging that it is unreachable.
Two members of the site's Discord chat site, "Infovorr" and "coyotic", confirmed that the site's future is uncertain at best. Infovorr said:
We have no idea, the former owner took everything down and deleted himself from the net.
He said he'd be putting up a tarball of the site and its contents, but no one's seen or heard anything more.
coyotic was slightly more optimistic:
If we can get the database from the the former admin we'll rehost it at the same URL, the forums may or may not be locked forever afterward.
Vivisector has been called an "anti-furry" site by some, though most of the users were themselves furries. Other would call it a "drama" or "criticism" site; the latter being the site's own favored descriptor.