You will still have private/public sections, interfaces (unless you class them as inheritance), classes and instances, the SOLID principles, composition over inheritance. OOP is a lot more than just large family trees of inheritance, a way of thinking that’s been moved away from for a long time.
I think they mean no consequences as in friends and family won’t have any upsetting reaction, work will still be the same, and so on. Like picking male or female in a game, it rarely matters what you pick, the game just rolls with it.