Thanks. Yes, I've read Nietzsche, including that essay and that book. Art could certainly be interpreted in a Nietzschean way, but I think the metaphor of empowerment is limited. I'd incorporate the other existentialists too, as well as various philosophies and religions.

The question is how we explain semantic truth. I take a pragmatic view that posits something like assimilation or exploitation. A set of symbols is true if it enables us to cope with the referent. The correspondence theory's alternative is to posit a relation of "agreement" between the symbols and the fact, which I think violates the insights of cosmicism.

I talk more about these epistemic matters here:

https://medium.com/the-apeiron-blog/what-is-the-nature-of-ultimate-knowledge-664642cf8147?sk=73f128be23b11ea1e09a8c3e83db51ed

https://medium.com/interfaith-now/beyond-the-fast-food-conception-of-ultimate-knowledge-227d8d43ad0f?sk=d29bd4319b9f775b4e67a28c104c6b31

http://rantswithintheundeadgod.blogspot.ca/2016/08/how-to-fathom-nature-of-truth.html

http://rantswithintheundeadgod.blogspot.ca/2017/03/life-as-dream-secular-myth-of-objective.html

http://rantswithintheundeadgod.blogspot.ca/2017/12/reason-attitude-and-ultimate-reality.html