Creativity: producing what is novel + valuable
Systematizable: can be enumerated via algorithmic operations
"As others have mentioned": that is not an argument
"not everyone else who already knows": also not an argument
Now, my point is that creativity as defined above requires a burden of proof to be defined as systemetizable. For instance, mathematical leaps are often achieved by a spark of "creativity" which breaks existing structures in a way which is difficult to grasp, and to call this systemetizable is a leap that requires a complex argument calling upon deep notions of computational theory and computational neuroscience (like producing a topological map of the creative structure of the brain and proving that it can be mimicked by a listable process).
Now, to apply this to art in a convincing way would surely be even harder. Do you at least understand my point? Or is "brain = physics = creative" satisfactory enough for you still? Thanks for reading in good faith this time. :)
Your assumption is IMO unfounded, it actually seems like you have the burden of proof given what I said above. Just because it seems more in line with your sense of it doesn't make it true, seems like you think creativity is some mystical nonphysical force (because if it were physical, it would be able to be modeled and computed, as the parent says).
Edit, I see, you're an artist so it's likely why you believe in creativity as a nonphysical force. I've noticed that many artists say this, with no evidence, while most engineers say the opposite, that it's systematized, likely that's why we're in our respective fields.