I'm not Catholic, or partiularly familiar with the inner workings of the Church's bureaucracies. From the outside looking that explanation seems to be something of an exercise in hair-splitting.
2 Corinthians 4: 7 "But we have this treasure in earthen vessels, that the excellence of the power may be of God and not of us..."
And the error is "of us" and not "of God" or of the things that God guarantees. Our own failures are all too obvious.
If you would like to be educated, I recommend Triumph written by Henry Crocker. It documents a lot of the issues and gives clearity. Of course from your perspective without much info, it looks like hair splitting.