The argument appears to be that using a computer to generate a piece of art is not a meaningful distinction from using e.g. a camera or a paintbrush, and so "computer art" is not a useful category. This appears to be couched in a more general political (and normative) theory of aesthetics which argues that art is (in the current political context) important insofar as it serves goals /beyond/ the production of "beautiful objects," e.g. highlighting inequity in the distribution of wealth, or other projects which serve the "needs of the people" contra "the rich and ruling."