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Even if the article gets the "linear RGB" idea wrong, it doesn't matter for the results, because each channel in all explored palettes is still 1-bit: either on, or off, sometimes with the constraint that red and green cannot be on at the same time.

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Unfortunately not when you're performing error diffusion, where the residuals are added to neighboring pixels. If you're doing it in the non-linear domain, you're going to get a different result during that diffusion step, even when you're dithering to a target 1-bit/pixel image.

You can see this visually in Surma's excellent blog post [1]: look for the gradient strips in the "Gamma" section.

[1] https://surma.dev/things/ditherpunk/

Good point, perhaps I should've picked some different palettes. But the ideas behind the blog post generalize to all palettes.

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