404 when trying to access a new community?

Hi, I'm sure this is just a noob lemmy question. I saw on /c/newcommunities@lemmy.world that there's a new YouShouldKnow community: https://sopuli.xyz/post/675270

But when I search for it through Sopuli, it doesn't show up, and if I use the ! link in the top comment, it returns a 404 from sopuli. It seems the sopuli server doesn't know about the community yet, how is it supposed to find out about it? Thanks