As I scrolled down, reading each point, I began to notice something happening to the number of each item in the periphery of my vision. It took until point 5 before I figured out what it was: the circle around the number is dark grey until it gets to around the top quarter of the screen (on my screen, at least) at which point it becomes light grey.

I'm still trying to decide if this is a good idea. Now that I have inferred it is functioning as a kind of visited-link visual effect, I can leave the page, return later, and quickly pick up where I left off.

Then again, none of the points are long to read. Worse, I've left the page after finishing reading point 7 and have no real interest in returning now, let alone after enough time has passed that I've forgotten where I left off (in which case I would likely also have forgotten what I had already read).

In other words, I'm inclined to think that this is mainly a needless visual distraction that actually disrupted me from reading the piece and has ever-so-slightly nudged me toward the decision not to bother returning to it.

That would seem to fall under the category of Bad UI.