I'm not sure where else to ask this, but is the main Nix/NixOS channel dead?

I see this message:

This room has been replaced and is no longer active.
The conversation continues here.

But when I click the link, I get this error in my client (Element):

MatrixError: [403] You are not invited to this room. (https://matrix-client.matrix.org/_matrix/client/v3/join/!6oudZq5zJjAyrxL2uY%3A0upti.me?server_name=0upti.me&via=0upti.me)

So I'm wondering, how can I re-join the main room, wherever it is?