The camera processes everything internally. There some build in machine learning model. It should not communicate or send anything images outside.

Of course the problem is that it's all closed source so you can't verify that. Cars also call 112 now automatically in case of an accident so I suspect that ripping out your modem may cause some warning lights on your dashboard which can mean you will not pass your mandatory technical revision.

So if you rip out your modem the camera will still work but you may have other issues.