First I must ask, where do these "principles" come from? Were they woven out of thin air by the writer of this site or do they have some doctrinal source?
Also, the docuмent that is cited about the changeability of the Magisterium here is Donum Veritatis, issued by the CDF under JPII, and as such about as worthless as a crumpled-up napkin under the table at Starbucks.
That being said, since this is about NFP I assume it's directed to me?
Richard Ibranyi, the Feeneyite, argues against NFP by saying that it contradicted Pius XI, and the writer of this article appears to be responding to his argument. But Pius XI has never been my knight in shining armor when it comes to slaying NFP. From my point of view, Pius XI's Casti Connubi set the stage for Allocution of Midwives, whether intentionally or not. Isn't it remarkable that the Church had not said anything about sɛҳuąƖity within marriage in an encyclical for hundreds of years, and then suddenly back-to-back they give us Casti Connubi and Allocution to Midwives? ( The latter is not an encyclical but was put into the Acta, meaning that they attempted to make it Magisterial ).
Pius XI had said the "infertile" times may be used in marriage, and from here it was only a short jump to saying that the infertile times may be used EXCLUSIVELY, as Pius XII said in the Allocution, which leads us into the realm of birth control. So while Pius XI's encyclical is not heretical, and certainly could be read as forbidding NFP, most people have read it in the exact opposite sense, as leading gradually up to NFP. At the very least the blow of NFP was cushioned by this encyclical's frank discussion of the conjugal act as well as the ever-increasing laxness towards sɛҳuąƖ matters in the Church at large.
That is why the author of your article C.M.M.M. tries to make NFP look like "development of doctrine" and it is -- it's a development of Satan's doctrine, accomplished through gradualism. Over generations, the crude rhythm method slowly morphed into NFP which became acceptable eugenics.
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I don't want to say any more about it for now. I'm going to prepare my official essays on NFP, covering every possible objection, sign them, post them, translate them into garbled French and German, the two languages I can write in somewhat, and then ship them out to the clergy here and in France and Germany. Then we'll see what happens.
I don't want to make any assumptions about a conspiratorial clergy until then, because I might alienate the handful of priests and bishops who aren't conspiratorial. Some of them are probably going along with everyone else, with the majority opinion, as I once did, and may not have given NFP much thought. I think it actually takes direct insight from God, meaning actual grace, to see through this one, such is the strength of the tractor-beam of modernism and rationalism that is sucking even the traditionalists and sedevacantists into a wholly un-Catholic pit.