Yes, I did ... it's old news. And if the couple is following all the NFP rules (this situation is covered by the instructors and in the book, if i remember correctly), they'd be able to catch the double ovulation.
You may know more about it than I do, but according to this article, the researchers were pretty shocked, and they said that "textbooks would need to be rewritten." This doesn't sound like "old news" to me.
I would like to see a study in which 100 fertile couples start January 1st using NFP. Then count how many are pregnant by December 31st. I would bet the percentage would be quite high. And thank God for that! The one thing that I actually like about NFP is that it doesn't work, thus allowing more babies to be born into the world.
With the symptothermal methods, this is guaranteed. The CCL has hundreds of thousands of chart histories from the last several decades, and if the findings of this new study were an issue, I would know about it from the CCL already. These findings affect NOTHING regarding the practice of the symptothermal methods of NFP. What affects it is couple motivation. So-called NFP failures are 99% NFP foibles, i.e., the couple knew darn well they were taking chances, but to save face they blame it in the method, not their practice of it. I know this from firsthand experience with couples using NFP. When directly questioned, they ALL admit it was NEVER a failure of the method.