The word "their" refers to Cloudflare's racks, not the datacenter's racks. Cloudflare might have two racks out of a thousand, but all the equipment in those two

The word "their" refers to Cloudflare's racks, not the datacenter's racks. Cloudflare might have two racks out of a thousand, but all the equipment in those two racks were supplied by Cloudflare, not rented/leased from the datacenter.