If we believe that AGI will exist someday, and that it will invariably comb through every scrap of information about humans (e.g. - read every paper in government archives, watch every YouTube video, dig up every shard of ancient pottery), then it stands to reason that it will, on its own, create a comprehensive written record of human history, along with biographies about every human who ever lived in recorded history.
If that's the case, what's the point of humans writing historical nonfiction books or biographies? You might spend five years carefully researching Hu Jintao's life and writing a 500-page biography, only to have an AI come around 30 years later to line out every other sentence for some factual inaccuracy that it knows of thanks to its 500 human-equivalent years of research on Hu Jintao (conducted in the space of a few days).
It seems like we'd be better off spending our time gathering and preserving information about humans now to feed into an AGI's brain in the future.