No, I don't think he cites an increase in violence as a problem resulting from technological progress. Nor does he claim that human intelligence has been diminished. You're due for a re-read, Derick.

His main points in the essay are 1) that technological development is inevitably destructive and harmful not only to Nature but also to humanity, and 2) that Leftism is a psychological mindset serving the stability of the technological system which results from some conditions developed within modern technological society; 3) technology unavoidably erases our freedom, and 4) these problems cannot be prevented, nor separated from the benefits provided by technologies, and 5) that only revolutionary insurgency against Technology will save Nature and keep humanity free as a species.