Meaning the system prompt(s), harness, entry and exit points, and skills. So the product is still "Siri AI", because of all the stuff that takes it from a raw infrastructure concern upon up into a "product" is Apple's responsibility.
Google are "okay with that" because Apple pays them $1B a year, per press reports, to be.
It’s very expensive but you got the box ready in your data center and is managed by both Google and partner.