I believe the common opinion of Zoltan Istvan is that he's mostly interested in self-promotion, and so I am not surprised that he is emphasizing the more contentious possibilities.
That's not really a fertile direction of criticism. Whether or not he's engaging in self-promoting provocation doesn't affect the validity of his position. Whether the USA can be trusted as the sole custodian of super intelligent AI is however an interesting question, since American exceptionalism appears to be in decline.
From this article by Zoltan Istvan, in regards to the looming Global AI Arms race, he says:
Now, to some extent I expect many Americans, on reflection, would at least partly agree with the above statement - and that should be concerning.
Consider the issue from the perspective of Russian, Chinese (or really any foreign) readers with similar levels of national pride.
One equivalent postionally reflected statement from a foreign perspective might read like this:
On a related note, there was an interesting panel recently with Robin Li (CEO of Baidu), Bill Gates, and Elon Musk. They spent a little time discussing AI superintelligence. Robin Li mentioned that his new head of research - Andrew Ng - doesn't believe superintelligence is an immediate threat. In particular Ng said: "Worrying about AI risk now is like worrying about overpopulation on Mars." Li also mentioned that he has been advocating for a large chinese government investment in AI.