Klein's entire whole life was spent in pursuit of the purest blue. That was his artistic goal. To find the purest pigment, to figure out how to make the clearest carrier oil. He spent his life on that, because he wanted to see it so much.
So no, you could not make that painting. That painting is only one small step in a life's worth of work. And you cannot simply do it again, because Klein already did it.
I often encourage people to start doing art in abstract art, not representational art, because often artists feel discouraged for the exact same reasons that make people dismiss abstract art: "well that's technically very easy" yes but technical skill is not always what art is about.
You should not stand at a painting and compare your own skill to it. You should also not stand at a painting and dismiss it because you think your skill is equal or better. The fact is, you are not that person who made that work and you are not living in their time or their location, so you could not make that exact work ever again. You can only make the work that YOU are going to make. Nobody else can do it, only you can. No machine or computer can do it, only you can with your own hands moving the medium around the canvas or shaping it or whatever that medium requires.
Art is the whole point, also. It's the entire point. Of all of this. Of everything we've done. The point is to make sure we have more time to make and enjoy more Art. That's it. That's the point of all humans do and build and make and keep running. That's the point of Society and Government and all of it. It's so we can make more Art and experience more Art.
Because the point is Play, and Art is a kind of Play.
And you can't make a computer play FOR you. You can't play for someone else, or exactly like they do, and you can't ask them to play for you. YOU have got to go and play for yourself. That's how play works.