Ridiculous. If God wills to permit someone to Sin, that does not mean that person is not Sinning.
God willed to permit David to sin with Bathsheba. God could have arranged events so that David would have inadvertantly fallen down a flight of stairs and been laid up in bed that day, instead of spying around for pretty ladies. But instead, He willed to permit David to commit that Sin.
David was still Sinning.
Did David have a choice? Could he have NOT sinned at that time? Remember—he was a man after God’s own heart.