Welcome to the discussion, my friend.
Most of us Romanists will side with the Orthodox in terms of the Filioque. It is not an issue.
These fine Reformed folks are claiming that Augustine in his sane years does not belive along the same lines as the Church today. That given, they claim him for the Reformed side, based upon his 30 years of heretical beliefs.
I guess they never heard of his Retractions? Blessed Augustine never allowed his pride to be greater than the Church. he always deferred in the end to the Church, and rightfully so. He was as Catholic as Catholic can be.