I don't know what to tell you. It's more than a little absurd to make the qualification of being able to do something to be that the output has to be considered a great work of art for generations.
I agree that the argument starts from a reduction to the absurd.
So at least we can agree that AI hasn't mastered the text medium, without further qualification?
And what about my argument, further qualified, which is that I don't think it could even write as well as a good professional writer - not necessarily a generational one?
If the end result is most books will be written by AI you need the possiblity of that qualification. If its only capable of certain types of book then we will need endless amounts of that.