Although I can see how you could argue that the concepts of an "emergency stop" and an "emergency brake" aren't technically completely identical in every respect (consider e.g. the difference between the emergency stop on a regular table saw vs. the blade brake on a SawStop), I think distinguishing between them in this case entails more nuance than actually exists.

Besides, I'm arguing for a system that would brake the wheels and shut off power to the whole car anyway.