Which manufacturer?

I have a Honda Civic and it's definitely an Android tablet shoved into the dash.

Yes, but that has no bearing on the ability of your car to run Android Auto. You cannot run it on the hardware that's built into the car. If you want Android Auto you must project it from a phone or tablet onto the display.

Yes, but the core system is an Android tablet in my car. That is my point. I would imagine that it's the same across Honda's entire fleet.

I was wondering which manufacturer was going QNX instead.

Yep. Honda has been shipping Android based systems since at least ‘16.