Ok, AFAIK, he was preaching "consecration of Russia" as the Fatima message - like a broken record - not, as you state, [again, please, I am not intending to insult or otherwise belittle you] minding his own biz.
His constant preaching on the consecration detracts and detours from the **actual message.
**Fr. Gruner does not preach what the actual message is.
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.