The name "Fake Eleanor" is immature
Calling her "Fake Eleanor" is being judgmental. It implies she got into The Good Place intentionally. She resents being called Fake Eleanor and she should. A truly nice person would not do that. This show is doing it to be humorous; it is using the "laugh at" mentality instead of "laugh with" mentality for humor.
It would be totally appropriate to call her Misplaced Eleanor and there are plenty of alternatives.
I don't like the show being judgmental and calling her that name that is not accurate and that she resents and portraying it as being good.