Devil Fruit are Devil Fruit! They're fruit that give people real cool powers, but you can't swim at all after eating one. [They certainly sound magic, in a way. But he doesn't seem to want to answer the actual question about magic--because he has no idea how to even answer that.

He finally lets go of his mouth, letting his face snap back into place, the shape going back to normal.]

Nope. It doesn't hurt at all. [What a weird thing to ask--he even laughs at the idea.] That'd be pretty awful, wouldn't it?