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That article is comparing black versus gray. If we're discussing a pure black home screen with no icons, folders, or widgets versus a home screen with a colorful wallpaper and bright icons, folders, and widgets, the difference in battery savings is actually massive.
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Depends on screen type. OLED screens can shut off #000000 pixels which does save some battery, but its negligible.
https://www.xda-developers.com/amoled-black-vs-gray-dark-mode/