I really want this to be true, but I'm not seeing it. The page has a note near the top:

Exactly who—and even what—Overlord is varies greatly from continuity to continuity, to the point that it could conceivably be argued whether or not the different incarnations represent different characters. See individual sections below for details.

The text "male" only appears in the word "malevolent". The text "binary" only appears in the link to the parent category "Non-binary" characters, so it doesn't seem like this is actually a non-binary (or similar) character.