Did you watch that video to the end? It takes Terri about 20 seconds to respond to the command -- common for brain injured patients.
But is indisputably clear that Terri was responding, and in spades!
If you refuse to admit the obvious then there's no point in my arguing with you.
That particular sword cuts both ways. And, I do have tasks I have to accomplish today. So, au revoir - may your sackcloth and ashes rest upon you lightly.