...because of the progress in mutual understanding that has come about in recent decades, Orthodox and Catholics refrain from labeling as heretical the traditions of the other side on the subject of the procession of the Holy Spirit;So progress has only been made in "recent decades"? Would that be the three decades since VC II? Another ten years of this nonsense of "mutual understanding" and there will be no heretics, no false religions, no Hell, no Purgatory; no need to be Catholic.
I do believe that's the one concession they want us Orthodox to make. After all, its we who regard the filioque as heretical. You insist we are simply schismatics and not heretics. No worries, we can all still call Arians (e.g. Jehovah's Witnesses), Nestorians (e.g. adherents of the "Unity Church" based out of KC, and the Church of the East), and Monophysites (oops, I forgot the same group says that was all just a problem with language, too. . .) heretics.
Of course it's a little odd--and typical of ecumenists--that at the same time they ask us not to call your formula heretical, they ask you to abandon it by repudiating Lyons and accepting the Greek text of the Niceo-Constantinoplitan creed as normative.