> I'm security conscious and made sure to disable all the data collection I could find in the companion app before removing my account, turn off remote access services, dig through the infotainment to turn off what I could, etc.

Android Auto, Apple CarPlay, OEM mobile app...Bluetooth??

Consider the business case of leased Comcast (as the largest ISP in the US) modems broadcasting open side-channel xfinitywifi SSIDs...essentially everywhere.