When Apple says your data doesn't leave their servers, that doesn't mean those servers have to be in their own datacenters or that Apple doesn't have other vendors that help them deliver their service. It also doesn't mean those companies have access to your unencrypted data. That data also, by necessity, likely traverses other networks in encrypted form on its way between you and Apple.

Apple claims that data they are in full control of your data from Safari, Maps, and Spotlight etc.... Data center or not, this contradicts both the spirit and letter of that promise.

This is basic logic.