Because the address is global and is routed to the nearest Cloudflare PoP. If you are in New Zealand then you get routed to Auckland, if you are in Scotland then you get routed to Edinburgh – and then Cloudflare transfer the data on their backbone to the GRE tunnels CCP has with them. See Cloudflare Global Network | Data Center Locations. My route to Tranquility, when not logged onto CCP’s work-at-home VPN, looks like this:
3 VFIS-GR-1.c.is [193.4.254.160]
4 fo-0-1-1-0-CCR01-Sidumuli.c.is [217.151.183.98]
5 rix-tg-gw.cloudflare.com [195.130.211.50]
6 172.65.201.188
where c.is is the backbone name for Vodafone Iceland and rix-tg-gw is at the Reykjavik Internet Exchange (RIX) where Vodafone Iceland and Cloudflare peer directly.