What a steaming pile of digested waste material. Have they ever thought about fixing their app? There are plenty of Android Auto apps on the store.
They removed that restriction last April[1], now devs can publish nav, parking, charger apps etc. Sygic[2] as an example.
[1] https://android-developers.googleblog.com/2021/04/start-your...
https://9to5google.com/2020/08/11/android-auto-navigation-ap...