[binarycrusader]

I'm not missing anything

I think you are missing something or perhaps you're interpreting this in a very pedantic fashion.

If you actually use the tool and ask it to export a 1-bit image you'll get a png file. If you zoom in after opening that png file in a editor like Affinity Photo or GIMP, you'll see exactly what the editor describes -- simple pixels that are either black or white.

The argument seems to be that it's not a 1-bit editor because it doesn't have a 1:1 representation between the individual "pixels" in the editor and the output.

However, I would argue it is a 1-bit editor because that's the final output -- a 1-bit image.

The fact that it maps each of the 16 'colors' to a 1-bit dithering pattern seems like an innovative way to provide 1-bit results.