I guess this applies for Java and C++ style "classes". This does not precisely apply to the first ANSI-standardized OOP system, Common Lisp's. Standard classes do not own methods, instead methods are specializations of a generic function that stands alone and dispatches on the class types (or EQL values) of all its arguments.
I'd really like it if Uncle Bob eventually has his fill of Clojure and moves on to explore what Common Lisp built decades earlier, then blogs about that too.
To add another point to the Common lisp over Clojure argument, DECLARE[0] offers a way to take advantage of type declarations natively.
I stopped using Clojure and don't consider it for new projects because I think types are invaluable documentation now, and it pains me that clojure and it's community doesn't believe the same way (typed clojure[1] does exist but it's contentious).