It is ambiguous. “Hannibal Lector, how great an actor was he?” This could mean Trump thinks the actor is called Hannibal Lector, or the “he” could refer to the guy playing Hannibal Lector, which would be Anthony Hopkins. Like a lot of stuff that comes out of Trump’s mouth, it is an inarticulate mush, with the true meaning implied rather than explicit, and not worth arguing about.