Not that I take the whole Bostrom superintelligence argument too seriously, but this is an incredibly weak argument (or more accurately, bundle of barely-related arguments thrown at a wall in the hope that some stick) against it. Feel free to skip the long digression about how nerds who think technology can make meaningful changes in a relatively short amount of time are presumptuous megalomaniacs whose ideas can safely be dismissed without consideration, it's nothing that hasn't been said before.