I think you are confusing Android Auto (projection) to Android Automotive OS, which is the infotainment OS of future Porsches.
It doesn't mean it won't be compatible with CarPlay. New Renault cars are using Android Automotive OS and still have wireless Android Auto and CarPlay.
Also Cariad is using Android Automotive OS now (AOSP version), just without Google Automotive Services (Play Store, Google Maps, Assistant).
Except that's also an issue with Volvo and Polestar being late at implementing CarPlay.
Renault & GM, both of which demoed their AAOS version, enabled both CarPlay and Android Auto, so you could use another nav "app" with Android Automotive via projection.
https://www.roku.com/products/roku-tv
https://www.amazon.com/dp/B0DD2P7YVW