Which would be to say that the "constant preaching" on anything, by the great Saints of the past, detracted from God in some way. That's absurd. And the Saints, not to say that of Fr. Gruner, but the Saints were very persistent in their preaching. It was only because all of this God and His Church, Heaven and hell, saving souls, mattered to them. They took it seriously - when others either did not or wanted it to just go away.
He preaches the consecration of Russia as "the end all apostacy" cure, which is false, is not what Our Lady said and will not result in Russia's - or anyone's conversion. The problem with Fr. Gruner is in what he neglects to preach.
Unlike the great saints of the past, history will show that Fr. Gruner's interpretation and preaching of the message of Fatima was false.