Any AI features and components would be included in their own Android distribution (pretend it's called Moto OS). GrapheneOS (a different AOSP distribution) would need to be flashed independently completely at the device owner's choice and doesn't have anything Motorola-related bundled.

Oh, weird. I didn't realize they were marketing it as GrapheneOS _capable_. I thought the intention/one of the selling points was that it'd ship with GrapheneOS _pre-installed_.

They do not have a say in what GrapheneOS runs. The signing keys for GrapheneOS are controlled by GrapheneOS.