Since when did difference require segregation? I'd say the difference between Lyle Talbot's Luthor and Jesse Eisenberg's Luthor is far vaster than the difference between Sherman Howard's Luthor and Clancy Brown's Luthor. And Michael Bell's Luthor in the '88 animated series was a straight-up pastiche of Hackman, so there's little difference there despite them being in different media.
That's the point. Yes, it's a difference, but it's illogical to see it as a more important difference than how characters are written or interpreted by an actor. If the video were talking about the production process or the visual design of the character, then it would be a meaningful difference. But if the point is to do an overview of how the screen interpretations of Lex Luthor have evolved over the decades, it is purely arbitrary to omit animation. It's not a meaningful difference to that particular topic, and it makes the overview incomplete for no reason beyond kneejerk anti-animation bigotry.