"every action which, whether in anticipation of the conjugal act, or in its accomplishment, or in the development of its natural consequences, proposes, whether as an end or as a means, to render procreation impossible" is intrinsically evil:"...........
Case closed. "Natural Family Planning" has a GOAL of 0%...it is hovering around 2.5% now but its appeal is that it is more effective than condoms, way more effective, thus, according to this modern (gag) catechism (Of which section you show was apparently was farmed out to Dr. Ruth to write), The padre Euteneuer is promoting something that is intrinsicially evil.
Malarkey. Abstaining from the marital act (for any reason), cannot possibly be intrinsically evil. If it were, it would be a sin to go on a business trip without taking your wife along. It can certainly be extrinsically evil in some circumstances, of course.
Besides, if you're arguing that the use of NFP to avoid conception for a serious reason is evil, then you're objecting to the words of at least 3 popes, two of whom (Pius XI and Pius XII) were pre-Vatican II. Here is what Pope Pius XI said in Casti Connubii:
Nor are those considered as acting against nature who in the married state use their right in the proper manner although on account of natural reasons either of time or of certain defects, new life cannot be brought forth. For in matrimony as well as in the use of the matrimonial rights there are also secondary ends, such as mutual aid, the cultivating of mutual love, and the quieting of concupiscence which husband and wife are not forbidden to consider so long as they are subordinated to the primary end and so long as the intrinsic nature of the act is preserved.