i have a question about Headunit Reloaded app

from what i can gather, installing the app on any tablet/android device, and subsequently connecting to an android phone, I would be able to use android auto?
so for example my car currently has an android head unit from 4 years+ ago, with 2gb RAM but doesnt have AA/CP support - using this headunit reloaded app I will be able to use AA on the car?

asking first because since it's a paid app on playstore.. thanks