One was the idea that the author could rule out the singularity because he wasn't aware of progress toward self-motivated AI that would be something like our own intelligence. This seems like a limited view to me because we wouldn't need self-motivation at all in AI to hit the singularity. Humans can supply the self motivation.
Suppose I'm using GPT-4 or GPT-44 trained on the corpus from sci-hub and it recommends experiments to me, or explains physics to me, etc. I could be the self-motivating part and the AI could be the intelligence part, and it seems we'd still hit the technological singularity.
Another problem I had was when the author characterized Elon Musk's "obsession" with the paperclip maximizer and described Tesla as a battery maximizer. It seems like the author kind of misses the point of the paperclip thought experiment, which is, broadly, that an AI's interests might not be aligned with our own and that misalignment may cause serious problems.
Tesla is clearly not a battery maximizer and it is clearly not a different class of intelligence from the humans and corporations existing today (though it may be towards the top of that class). Neither of those things would necessarily be true of an AI.
Given the position of my scrollbar it seems I was only starting to read this piece, but already finding what I think are significant problems as the author sets up the argument, I'm hesitant to spend more reading.