Of course. Humanity is an experience, yes, but it is also an identity.

[Setting aside the fact that he never ceased to be biologically human...]

It is who I am. I didn't become like the other immortals at home when my aging was suspended, because I was different from the start. I came into the world in a different way and saw it from a different perspective. Nothing can undo that foundation of who I am. I was never anything like an angel - I am an immortal human.