My two cents when it comes to biopics is that if the biopic is doing its own thing with the true story it’s based on, then it should qualify under original screenplay, but if it much of its material is pulled from a book like with Oppenheimer and Killers of the Flower Moon, then it’s fair game to consider it an adapted screenplay.
Anyway, yeah, there’s no reason a movie based on a doll should be nominated as an original screenplay.