To be honest I find it fascinating...
There is a very persuasive theory of creativity set out in David Deutsch's book
The Beginning of Infinity, which suggests that the key to creativity of all kinds is grounded in some kind of evolution (taking that term wider than the "origin of species" definition).
He argues that in the mind of the creative thinker, there is a continual process of variation and selection occurring. Think of ideas, reject this one, take that one forward as promising, gradually or not so gradually refining what one produces, but also constantly injecting new elements and keeping the ones that work.
Isn't this ever so close to what we do when we (try to) improvise? Make little experiments - some sound good, so build on that, the ones that fall flat (sometimes literally) we move swiftly on from.
I think the computer experiment reported is very limited by the range of what can be allowed to vary ... but within that range, I do think this is coming close to some sort of real, albeit limited, creativity: through variation and selection. BUT - it is NOT the computer that is being creative, because the
selection part is crucial, and is delivered by humans. So it is the broader "system" taken as a whole and including the human participants, that is being creative.
(I feel a blog post coming on, but needs more thought
)