Is the Plymouth Duster a fastback?

Hey all,
I was talking the other day with a few buddies about my Duster and they said that according to Wikipedia(I know not reliable at all) the Duster is a semi-fastback. My argument is no it isn’t as it doesn’t slope to the back of the car, so who’s right here? Is it a fastback, semi-fastback, or neither? Lmk thanks!