He is. She was there when he came out of stasis.

[His hands grip together, remembering how Ramsay had grabbed her arm and left a mark on her. Gods, he should have found a way to kill him before he could have emerged from the pod.]

I think he has been calling himself another name. Not many know what he looks like or who he is. There is only one person from our world I haven't met yet and it's Willem Rivers. I have never heard of him and everything about him doesn't seem right.