It isn't just React / Non-SPA, even by SSR / HTML standard there are no needless moving graphics, page / section transition. It is simple, accurate and to the point. I like the word people in this thread here to describe it as "artisan".
It really is a page of Art.
If there is only a few thing I could nitpick. Sections or indicator of how long the article is. The Moon is long... very long. And I understand why he want Image on load just to save bandwidth but personally I hate when image only start to load and appear when I scroll close to it.
I hope this will inspire a new generation of people to rethink about Front End.
Frontend dev here. Hats off to Ciechanowski as always. The code is readable and works well, and looks written with love. I wouldn't do it this way, but then again, I wouldn't do this at all. Probably couldn't.
This is an example of frontend as a craft. I am confident it was written with a model M keyboard and his home office is referred to as an atelier.