This is just science fiction. To mention "recent developments" in the introduction is somewhat misleading considering how far the current state of technology is from their hypothetical superintelligence. We don't have superintelligence, we don't have the remote idea of how to get started on creating it, in all likelihood we don't even have the correct hardware for it or any idea what the correct hardware would look l…
That's the mainstream opinion on every. single. revolutionary advance. That you and everyone else believes it's not going to happen ever has almost no predictive power as to whether it actually will.
Also, this is not the mainstream opinion on e.g. fusion, or electric cars and smartphones (20 years ago), or a computer in every home (50 years ago). Those have been arguments about money and practicality, not about "we don't even know how such technology would look or what it would be based on".