This is so cool! Excellent writeup also.

I feel like I understand it all except the last step:

> I could feel the closeness, and a very simple fix for this kind of aliasing is to supersample: apply the dither thresholding at a higher resolution and downsample.

Here he shows a dither pattern that isn't monochrome, but has grays (cause it's downsampled). But the picture in the end is monochrome again. How does this work? How does he downsample the dithered result while staying monochrome?