Everything in a Tesla is remote controllable, down to the odometer. It’s through Tesla’s own system but I am 100% sure that system has an Internet connection.

Heck I patched in my non-smart-car into my smarthome using an Onstar integration, I can lock and start it using Siri. Tesla’s system is just a way beefier version of Onstar. I wouldn’t be shocked if there was an app just for Elon to play with it all.