I didn’t follow your link, but from previous reading I recall that even Prager, wise though he is, fails to really think it through and come out against contraception.
He has dealt with that in other sources. It is not the important thing at all to what he says in the article. He is giving the origins of Civilization, or at least civilization as we know it. Contraception and medical abortion are very recent and not really germane to his topic except as a follow on that illustrates the effects of ignoring the origins. To throw him over because he doesn’t get to your own pet peeve, which is a major peeve if you are talking about modern and recent politics, is a bit squint-eyed, I think.