It is not a lie. Too many bland characters and too many variants of Batman and Superman. Even Superman's enemies are variants of Superman. It's disgusting really.
What? For a comic book guy you certainly lack knowledge to most of the things that happen to comics, even to those as big as Batman & Superman. Variants? Have you seen Batmans Rogue Gallery? It is probably one of the most diverse and best in the whole comic book world.
Supermans enemies are variants of him? Outside of Zod & Bizarro? Brainiac is a Superman variant? Lex is a Superman variant? Darkseid is a Superman variant? Metallo, Parasite, Doomsday, Mongul, Eradicator, Gog, Mxyzptlk, Toyman, Grundy, Livewire, Imperiex, etc...
In almost any comic book though, there will always be a variant villain across the hero, they always try to make a polar opposite or someone who is really similar to clash with (like Flash & Prof Zoom) but not all are variants of the hero, come on now.