Earlier quoted context omitted.
It's nice because scrolling is a 1d interaction, and the path you're navigating is 1d. It's superior to a movie because this scheme makes it super simple to control how long you spend at various points, and they open up optional interactions at various points. I don't understand why a lot of scrolling would be problematic, doesn't seem different then e.g. pushing arrow keys over and over when playing a video game.
A single repeated movement is very tiring. You compare to games, but games have you press different buttons, and there is usually either some rythm and variety to it, or at least hold the button (e.g. in a racing game you usually hold the acceleration button) In this website you need to keep scrolling, which is pretty monotonous, it would be equivalent of spamming "next" on an overly complicated late 2000s Windows so…
Or scrolling through a long document, as the scroll wheel is designed to do?
You're not supposed to scroll straight through, there's stuff to see and read! If you want to skip around, there's navigation on the right side.