That is of course not to say that Pius XII thought that a Protestant geneticist has some kind of Magisterial moral authority. The point is, Pius XII was intelligent enough to consider the experience, training, and insights of an intelligent man of good will who happened to be Protestant.
Back to the topic at hand: Bravo to the Humanum pro-Marriage group, Catholics and non-Catholics alike. They can make their positive contribution wherever intelligence/good will can get the respect it deserves.
And still no response from you regarding Mortalium Animos.
Not surprised at this point.