The creator does have experience producing physical paints and pigments
Unless the creator can overnight formulated inks to my print shop, it is not a practical alternative to Pantone, because Pantone’s business is selling consistency in markets where consistency matters.
I am not saying it is not a nice piece of work, but it is only applicable where consistency doesn’t matter very much…and though that is most of the time for most people regarding most things, what you get correlates with what you pay for.