I did - the fact that UI looks the same does not warrant any connection that CarPlay is replacing the OS. You can check the video of MrJWW to see the actual UI of the OS. Maybe Aston did not want the car to feel so much different vsa the CarPlay Ultra experience and tweaked the OS UI to it.
CarPlay has always been a skin (Wrapper) that runs on top of any car OS. This one is only different where it has wider access to the car's controls.