What are you even talking about? Dark mode doesn't have to be related to the OS at all. In the end it's just applying different colors. They could easily let us switch to a mode with different colors when we want. It doesn't need to be linked to windows (which does actually have a dark mode).
But yes, Evernote, we still need dark mode for windows. When programming switching back and forth to Evernote is blinding. Please. It's the only feature I've wanted for years.