It's gated behind a CSS "prefers-color-scheme" media query, so it will not affect people like you in any way, who haven't opted-in to dark mode in your operatin

It's gated behind a CSS "prefers-color-scheme" media query, so it will not affect people like you in any way, who haven't opted-in to dark mode in your operating system. Some people suffer from things like eye strain and this would improve the accessibility of the website.