Hey, thanks for your comment! As I don't know who Daneel Olivaw is, Erin has no connection.

And you're technically correct, "they" and "them" is used for multiple people in English - Except for when its used as a "neutral" pronoun, when you don't know if someone is male or female.

For example: I don't know if you're a man or a woman. To avoid getting it wrong, I would say "They left me a nice comment".

Erin is neither male or female, as they are an android that is able to shapeshift (explained in "AIOA", a story that came before). Thus I chose to adress them not as "he" or "she" but as "them".

I hope that clears it up! :)