The painting analogy isn't really warranted, and this article is a metaphor at best. You could replace painting with poetry, music, or building furniture. There are a few definitions of painting, and there's lots of art being made that plays at pushing those definitions, so I can't claim to have the definitive one. However, essential things, such as the interface (which is in no small part responsible for the content of a painting), and the actual final product as object, are very, very different. A medium is also defined by its constraints, and from code to screen or printout the constraints of image-making are unlike anything you have in painting.

Generative art is beautiful, but not because it has anything to do with painting.

Edit: If this seems harsh, it's because I care about code just as much as I do about painting. Using any one of them as a catch-all for stereotypes is intellectually lazy (and often irritating).