They are probably confusing google auto with bluetooth.

On Android there is an option called "Bluetooth tethering - Share phone's internet connection via Bluetooth" . If it is On and you are connected to the car's bluetooth it will have internet access via your phone.

	▲	jklinger410 4 hours ago \| parent [-]
		I'm suspicious that the car's system can do this. I don't think we should be assuming your car can tether internet through bluetooth until we see someone snoop Toyota-bound traffic being routed through their phone.