> How is this supposed to work? (I use Arch BTW) supposed I'm in a country X, does Cloudflare basically caching the request to server that are in country X? But I'm already close to that server and I'm always cautious with mirrors that are in country X, often they were out of date :(

According to what I read in their main page https://cloudflaremirrors.com/archlinux, they seem to be caching the packages from mirrors and serving it via their anycast network.