That would indeed be a correct assumption.

"My name is Delta Moran." Using his sister's surname should be safe enough; if anyone had even heard of his family, that's the side he'd rather associate himself with, anyway. As for why he's here, he's not about to say a Black Widow told me to come after all the persecution, so he phrases his words carefully. "I am seeking employment as I am no longer needed at my former home. I have training as a librarian."

And that will either get him in the door or it won't. It should be the right thing to say, though, he hopes.