They were counter-revolutionary, however. As for heterodoxy, no. They did not deny credal teachings (except to the extent that all Western Christians defy Orthodoxy on the origins of the Holy Spirit, which was as much a cynical act of branding as anything else, which is also most of the reason the anti-modernist media from EWTN to LifeSite to Church Militant raise such a stink. Indeed, Casti Connubii was all about keeping a Catholic brand after Lambreth approved birth control and affirmed that implantation was the start of life. You are not arguing for Dogma, you are arguing for your Brand. Brands can and should change, especially when counter-productive or proved harmfull.