You seem to have quite a narrow and specific definition for the term "accessibility.
Here's the closest comparison that comes to mind: would you consider an arachnophobia toggle to be an accessibility option? Because I would say that falls into the same category of "changing visuals within the game to make some players more comfortable".
I think a colorblind filter, subtitle toggle, and gender/pronoun options could all appear in an accessibility menu and it would be completely reasonable. Why would a penis toggle be out of place?