Say I type in nixos wayland_display into google and end up on https://nixos.wiki/wiki/Wayland because it is the higher result.
Currently I have to click the url bar, change .wiki to .org and then have to go to the subdomain and add in wiki.
With the redirect, I could just change nixos.wiki/wiki to nixos.org/wiki and I'll automatically land on the correct article on the official wiki.
This would be a much simpler explanation to other people too. "oh, that's the wrong wiki, remember to always just change .wiki to .org.