Doesn’t look like the laptop they tested, the Asus ZenBook 13 UX333FA, uses OLED. So yeah it isn’t gonna make a difference since you’re still lighting the full backlight. But it makes even more of a difference on phones, since their processor is less powerful by comparison.
negligible difference in energy consumption
https://www.digitaltrends.com/computing/dark-mode-laptop-battery-life/
Doesn’t look like the laptop they tested, the Asus ZenBook 13 UX333FA, uses OLED. So yeah it isn’t gonna make a difference since you’re still lighting the full backlight. But it makes even more of a difference on phones, since their processor is less powerful by comparison.