I think they use a combination of free throws, form, volume, and 3 point %. But i believe it's a stew of analytics
I agree with that. Clearly we both agree that the NBA cares about your shooting numbers, including your 3P% (especially when you're projecting as a wing!).
I'm only a lawyer and I don't talk to NBA scouts weekly like some of our genius posters here but I knew that was baloney.