Ignoring the straw man argument here yes actually there are plenty of examples of individuals with no outside influence of art styles or references creating artworks. It's called outside art.
https://en.wikipedia.org/wiki/Outsider_art
Second, your Outsider Art is something completely different, funnily enough a strawman. Surely you're not claiming that the creators of outside art have literally never had any sensory input in their lives? Or do you really think that one painter in two timelines, in one blind and in the other not, would paint exactly the same stuff?