How on earth did you get any of that from the illustrations? I got the "Snow Leopard is a loner" reference (hah), but I don't see anything deprecatory towards Python or anything suggesting the book will actually teach Ruby syntax or idioms as opposed to general programming concepts. Anyway, the references to operating systems and programming languages are clearly meant for the adults who are reading alongside their kids. I very much doubt a young child with no prior exposure to computer programming will pick up on the jokes.