The making of art is a personal experience, and the beholding of art is another type of personal experience. If we suggest that the two can be separated such that we can behold art without knowledge of the production of it, well I would consider that wrong. There is a reason each piece in a museum is given a plaque telling its medium and brief background. This is because the meaning of a piece is derived from its context and cannot be separated from it without making art an arbitrary sensory stimuli.
The issue with the reduction of art to experience is that it ignore that our knowledge shapes our experience, and so the more we know about an artist and their process, the more different our experience of their art will be.
If one sees the Mona Lisa at the Louvre, they might not think much of it if all they know is that it's very popular. Another who knows why the Mona Lisa is particularly popular, because of its historic theft, has a different experience of it. And the person who knows of Da Vinci's life, who has read his journals, knows of his elaborate painting process and sophisticated details and meaning supplied in his paintings, why that person derives much more joy out of the work than one who merely sees it as a visual appearance producing merely a arbitrary liking/disliking.
Perhaps you might enjoy an AI composed track, but would you not enjoy it more if instead that track were human produced, particularly if you held more knowledge of the people making it?
As for meaning living in the reader, that cannot be true, for a person can find meaning in tea leaves or moving clouds. True meaning, as intentional, is not derived, but supplied, and it is the goal of every reader to behold the authors vision. That one fashions a different interpretation for themselves over the authors intentions is of necessity, for no two minds will see alike, but to look only for the reflection of oneself in art and not look beyond, why that is the death of art, for art is the revelation of the soul.
We don't have to agree, but the biggest problem I find with this take you're now bringing is that it leads to an infinite regress, you can forever expand your knowledge about the origin of something. Then, not to mention, that often we construct from evidence which is already an interpretation with data loss.
The Mona Lisa example actually supports both our positions in my opinion: someone can have a profound experience of it knowing nothing of Leonardo, while someone else has a different profound experience knowing his biography. Neither experience is 'false', they're just different modes of engagement with the same work. Personally, I have even experienced the inverse throughout my life.
Growing up not speaking English, and being flooded with American culture through radio, I was deeply moved by lots and lots of music made by foreigners that sounded like absolute gibberish to me. Later in life, after learning about the meaning of certain songs, I, unfortunately, lost some of my appreciation for it. Some may call that alienation, but to me it was a form of naivety of a child that enjoyed just sound in its pure form without it being tainted by any derived or supplied meaning from its creator that was attached to it through accompanied lyrics.