What website? I only saw a white page. (I have Javascript disabled)
Come on, the website is only text, images, and a few forms, why would you render it in JavaScript. I don't see any additional benefit compared with plain HTML, CSS.
It is not a rich web application, even if it were.
Also, there's been server-side rendering for a while now.
Edit: Opinion
Oh my, the article describes itself.
I stopped reading the article after 10 lines. I'm not easily offended, but when reading an opinion that has the F-word every line, it's just a turn-off.
I won't honor it with my IE (don't feel like giving Stripe a ping).