Yes, Gary Wills’ judgments on Catholicism cannot be said to be orthodox interpretations of the Faith by any stretch of the imagination.
He started out his career, ironically enough, under the tutelage of the late Catholic Conservative William F. Buckley at National Review. Bill Buckley apparently found him quite the bright young student whose latin was better than his and Bill Buckley gave him a gig and recognition.
Thing is, as time progressed, Gary Wills drew further and further away from Buckley’s conservative catholicism and soon left National Review. By then, however, he had made quite the name for himself and was soon writing many historical bestsellers.
He writes quite often for the progressive New York Review of Books where he has been quite scathing on the recent sex scandals within the Church and I believe he disagrees with the Church’s stance on homosexuality and other things. On other matters in Catholic doctrine however he toes the party line at times.
Not sure if this helps, but if you have already read his aforementioned books you are way ahead of me in understanding his faith, which I have only gleaned from his many articles.
God Bless.