Assisted work is the big clarifier I think

Is a picture edited with photoshop invalid when it uses content fill? What about a picture taken with an iphone, where AI could be part of the phone's processing pipeline or even generate details to make up for lack of optical zoom?

Does spell correction invalidate a book? what if there's AI rephrasing features at work? Where's the line?

I think as you get into those side questions, the only reasonable position becomes treating AI as tooling no different than any other piece of equipment.