no, the site isn't down. you have been shadowbanned. kiwifarms shadowban you by blocking your access to the site. how do I know this? well it's because I can visit the farms just fine. see
my reply.
circumventing the farms's creepy censorship is really easy. either you use any VPN (be it a free one or a paid one) or you use the tor browser (don't worry, it's available on Linux, mac os, windows, and android).
edit: the farms's onion link:
https://kiwifarmsaaf4t2h7gc3dfc5ojhmqruw2nit3uejrpiagrxeuxiyxcyd.onion