Yes. In-car WiFi should obviously work even if the network connection break (remember, we're talking about working without Internet, not disallowing Internet at all) - WiFi is a local wireless network protocol, not magic Internet summoner. With actual Internet connection down, it should still maintain the local network for connected devices.

As for the rest, none of those look like they should be first-party features. "Spotify on the car radio" is a third-party integration to a system that should also work off-line, e.g. for playing music off removable storage, casting from your phone (via WiFi, without Internet), or, you know, working as an actual radio. OEM maps with traffic is something hardly anyone wants anyway, because they universally suck relative to some TomTom screen, or even Google Maps.