The thing about the internet is links. When I (theoretically) open a daily paper there is nothing for me to click on. The publisher has to make sure that the whole thing is self contained and can be consumed without any outside reference.
Websites, by design, are not self contained and that is because of links. Being able to reference other content through links is fundamental to how the internet works. The subscription/paywall model is anti-internet, because it breaks links.
While I do find some of the authors reasoning questionable, I concur: The classic subscription model, even though it may be the very thing that is keeping some publications afloat and very profitable, is deeply flawed for the internet.