And this isn’t the first time this season that a Bat-reference has come up, as one character namechecked Gotham City in a past episode.
The Caped Crusader definitely loves his gadgets, and he’s faced demons both emotional and physical, so that fits, too.
The cousin she’s referring to is obviously the Man of Steel, and the vigilante she speaks of is almost definitely Batman, although the creative team knows enough not to just plainly state game-changing things like that.
Even though none of this means Batman is coming to National City anytime soon, there’s the small chance that he could, and regardless, there are still large implications that come from Batman being around in this section of DC TV.