I just came in here to update everyone that history has vindicated me.
The subway app has each sub with it’s own specific ingredients and then you can customize them after, so some subs come with mayo by default, some subs have tomatoes by default, some subs have a certain sauce etc.
So apparently Subway all this time DID have a specific idea of what was on what type of sub, and they were deliberately hiding it from us all these years.