This is a canard. From my readings, which have been quite basic, it seems clear that all forms of abortifacient contraception are completely condemned in all Orthodox Churches, regardless of their canonical jurisdiction. Where a range of opinions do exist is on the use of non-abortifacient contraception, such as NFP which is also condoned in the Roman Catholic Church. So please stop pretending that there is some higher ground to stand upon just because the Orthodox don’t pretend that there isn’t a range of opinions on these things. There is also a range of opinions among Catholics, even as you pretend that “Roma locuta, causa finita est”.
According to Catholic understanding, NFP is not a form of contraception. This is because, again according to the CC, contraception entails the use of some method (barriers - condoms, surgical sterilization - vasectomy or tubal ligation, spermicide foams and substances, hormonal methods such as birth control pills, patches, implants) to prevent the natural outcome of the marital act which is pregnancy. NFP on the other hand does not use any method or means to interfere with the natural outcome of the marital act. NFP can be used in two different ways. Some couples will abstain from the marital act during the fertile period of the wife, in order to lower their chances of conceiving a child. Others who try to conceive will do the opposite, will observe the fertile period and engage in the marital act during that period in order to increase their chances of conceiving a child.
I know the difference between contraception and NFP (natural family planning) is difficult to grasp for many people, and some people will say there’s no difference between them, but the Catholic Church on her part does not regard NFP, when it entails periodic abstinence, as a form of contraception. Here’s a humorous way to show the difference between abstinence and contraception: let’s say I mention to my girlfriend’s father that we are contracepting. Then, when he draws his shotgun to kill me, or before the poor man is about to faint of heart attack, I explain to him, that in fact we never did anything inappropriate whatsoever, I haven’t even touched his precious daughter apart from an occasional peck on the cheek!

So that’s abstinence, and why would I call that contraception - unless I have a death wish? Having sex with his daughter, while using the pill or condoms, and abstinence on the other hand, may both have the same effect of avoiding getting her pregnant, but yet it would be quite mistaken to put the moral sign of equality between the two!

And NFP, when couples are trying to postpone having babies, consists of periodic abstinence. The CC does not regard mutually agreed periodic abstinence sinful in a marriage, but the use of any method (condoms, sterilizations etc) that tries to prevent the natural outcome of the marital act is considered sinful by the CC.
Also, while marriage MUST be open to children, i.e. those who do not want children at all are not validly married in the eyes of the CC, the CC does not command married people to engage in the marital act as frequently as they can and to have as many children as physically possible. Periodic abstinence and an effort to postpone and space pregnancy through recourse to abstinence, are fine with the CC.
I’m not saying you have to agree with the Catholic Church’s position on this, but I wanted to present the Catholic position on why NFP is not contraception.