As someone who follows Kurzweil that seems odd as he predicted it accurately well ahead of time (eg https://www.solarpowerworldonline.com/2016/03/futurist-ray-k... )
For me the more interesting question is why are people in denial about Kurzweil's tech predictions? And this author presumably unaware of them. Even if you personally think the man's a crank, his basic procedure of plotting tech growth on a log scale and doing an extrapolation isn't really rocket science.
And most are still in denial about the singularity/immortality stuff. Prepare for a lot of 'why everyone missed' articles on that in a decade or two. (https://www.wired.com/story/big-interview-ray-kurzweil/)