I generally agree with the author. I don't have hard evidence but basically feel that the culture, ethos, magic, whatever you want to call it is gone. Does this mean innovation is dead? Of course not! As the author pointed, it will just likely be more spread out.

Also, I think it's important to appreciate that the formation and growth of Silicon Valley was a remarkably special thing but was bound to eventually hit the diminishing returns phase of faster compute, faster internet, smarter software, etc. Silicon Valley started with a transformative and enabling technology (the transistor) and from there we built a remarkable hardware and software ecosystem over the span of a few decades around that technology. Those seem to be the two elements in order to 'replicate' SV: a transformative technology that spurs an ecosystem of technologies, all of which interconnect and benefit from each others innovation.