Really? Lectures given a mere 30 years ago are now irrelevant? You make me feel old.
BTW, I'm not saying I agree with the content of those lectures. Only that dismissing them because you think the modern world doesn't hold those views is silly. And, yes, I'm aware that more recent pontiffs have expressed different views.
The teachings are most definitely relevant, if for no other reason than that perhaps a billion people worldwide consider the teacher to be directly important to them.