Nuwa Pen for fiction writers?

I was wondering how Nuwa Pen may be able to support writers who often need to go back to the original text and make corrections, add or delete entire sentences, etc. Will the Pen create a new document with only the most recent changes (in which can it will not be supportive), or will it integrate in one document the whole history of the changes made, like in a real manuscript? In this latter case, I can tell you the pen would be a real game-changer for writers, especially fiction writers...