There are only five pages (it shows you in the right pane). I had no problem with clicking "Next" but even if you dislike that I suggest you persist - it's a nice project, a well written article and worth reading.
It's a good point, though, and one I heard earlier. Spritesmods used multi-page articles from the beginning (which is nigh 14 years ago now), initially because, I dunno, more of the web was like that? Later, when I needed the money, it was because I liked header ads more than long articles with interstitial ads. Now I don't quite need the money anymore, maybe I should throw out ads and either default to everything-on-one-page or at least give that as an option.
Worked the same for me. I actually like the css on the site, but I refuse to click through multi-page articles. Especially when I am not even informed about the total number of pages.