Only here do I disagree with the reviewer. I don't own Douthat's book yet, but if Ross has said Bergoglio never formally endorsed communion for the divorced and remarried, I would ask him why Francis, describing them as "authentic magisterium," ordered the official publication of his letter to a group of Argentine bishops and their (heretical) guidelines for the interpretation of "Amoris Laetitia," his apostolic exhortation on the family.
Update: Pope's letter to Argentine bishops on 'Amoris Laetitia' part of official record
I think Douthat's argument is that, although that sort of thing could be a formal declaration of heresy, the Buenos Aires thing was still too ambiguous to qualify.
Ambiguously endorsing an ambiguity.
That's how this guy operates.
God is not the source, if a man can't say a Yes that means Yes and a No that means No.