I would be very skeptical about anything that may be even remotely connected with Fr. Gruner, he's been on the lunatic fringe for some time. he's as much as called the Pope a liar on more than one ocassion.
Father Grunner is mentally unbalanced. He is a classic example of a conspiracy theorist. He sees himself as the last lonely crusader for the preservation of the true church. He has gone beyond extreme with his fixation on the Fatima letter. The Fatima Letter is WAY down on the list of Catholic priorites.
Then there is Cardinal Ratzinger. He is the pope's right hand man. There simply could not be a more stable, wise and trustworthy Catholic leader. When he says something you can trust it. So whatever Grunner says should be tested against what Ratzinger says and Ratzinger should be heeded not Grunner.