Well, my comment was more eluding to the fact that, until very recently, many Americans learned Latin as part of their primary school education. It was requisite knowledge for university.
70+ years ago is not "very recent" when talking about schooling. Public schooling has only been widely available in the US for less than 150 years and only widely mandated for children in the last 100.
Conspiracy theorists would have a fun time with an official language of the Vatican being selected for the purpose of anything as basic and universal as time itself, even if just for a label.