It removes it enough to hide from the dealership. Dealership are not tech savvy. And the mechanics doesn't care in reality, and beside too busy to take their time with each car. The only one that really cares is: Honda.. The dealership doesn't want to replace a head unit display, ship the broken one to Honda, and have Honda say to the dealership: "you owe is $1500 because this one was rooted, you should have detected that. We gave you a service builtin for you to be aware of that, and you should have refused servicing or charge the client for replacement as it is out of warranty".
You want to hide it, to not have the dealership refuse service under warranty for something not really related, but they think it is related, because they want to cover their ass to the max. And they don't want, and you don't want the dealership to go after you, if Honda is after them.
If you want to do a head unit replacement, say the touch screen is acting funky, then you better remove Honda Hack completely (either way you'll need to re-install it from scratch with the replacement). Also, be sure to clear the web browser history, cookies and cache in the settings to leave no trace, and better yet, uninstall Honda Hack, and do a system restore. Just in the case they start checking for hints, or they plug the device and see it is a rooted (that they can check, even software that you can install yourself form the Play Store will tell you if the device is rooted or not). If you are leasing the car, you better uninstall it, and do a factory reset on it, making sure there is no trace. Remember, on a lease, you don't own the car, Honda does.
Honda hack is still there, the device remain rooted. But the apps, including Honda Hack own app is gone.
Nope. Write it down, take a picture, there is no way to get Honda Hack back (beside factory reset and re-installing it, and re-install your apps) if you don't have the password.
What option? I don't recall from the top of my head.