From the description of "Diagnostics & Usage" reporting on the device itself, it sounds as though the carriers can only obtain that data via Apple. This would reconcile that wording with the finding that selecting "Don't Send" appears to disable Carrier IQ logging as well.
[..] To help Apple’s partners and third-party developers improve their apps, products and services designed for use with Apple products, Apple may provide such partners or developers with a subset of diagnostic information that is relevant to that partner’s or developer’s app, product or service, as long as the diagnostic information is aggregated or in a form that does not personally identify you.
[..] To help Apple’s partners and third-party developers improve their apps, products and services designed for use with Apple products, Apple may provide such partners or developers with a subset of diagnostic information that is relevant to that partner’s or developer’s app, product or service, as long as the diagnostic information is aggregated or in a form that does not personally identify you.
http://daringfireball.net/misc/2011/12/ios-5-diagnostics-pri...