<Neither orthodoxy nor truth divide into right corners and left corners and far-right corners and the like>
Of course they do; they always have. Difference of opinion has always driven the search for truth; words like "orthodoxy", "heresy" and "heterodoxy" are often lobbed as weapons in an attempt to control the search or to declare that it's over.  It never works; let's pray that it never does.
There was an equally erudite group of scholars who objected to Humanae Vitae (though they didn't have the arrogance of this group: no reference to 'correction', still less to 'heresy.')  They didn't get very far -- though time and experience have proven they were right.  
Respect is in the eye of the beholder: the sheer. preening arrogance of the writers of this "correction" seems obvious to me; apparently you don't see it.  Difference of opinion, I suppose. It's hard to believe that anyone who has read Faggioli could dismiss him as "anti-intellectual". But you just did. And so it goes.