There's a record of Luther dismissing Copernicus, or at least geocentrism, though it's from four years before On the Revolutions of the Heavenly Spheres was published:

"So it goes now. Whoever wants to be clever must agree with nothing that others esteem. He must do something of his own. This is what that fellow does who wishes to turn the whole of astronomy upside down."

But that's pretty mild for Luther. If he wasn't using scatalogical references, his heart wasn't really in it. We only know about it because many of Luther's casual conversations were recorded; he was literally complaining about it at the dinner table.