The article does not include the word "density" at all. Switzerland has 2.5x the population density that the US does. I absolutely believe that US regulation choices encourage telecom monopolies and suppresses service in the US, but it's impossible to make a credible argument for that without acknowledging the density challenges that the majority of the US (geographically) faces.
It's fair to critique this article not covering this, but I also think this is largely a red herring. The vast majority of the issue in the US is suburban, where density isn't really a problem. The US has a lot of rural areas, but they represent a tiny fraction of the population. As a comparison, Australia has roughly the same land-mass as the contiguous states, but with less than a tenth of the population. It has it…
You don't have to, for example, shut down a road when putting in rural lines.
It's a mistake to think that population density has anything to do with the difficulty of getting high speed internet. It's nearly completely unrelated.