As I have observed often before, although Goebbels believed lying to be a necessary tool of the propagandist, in public he always maintained that his propaganda was truthful. Indeed, he preferred to tell the truth, although often selectively.
Sowell’s quotation is also more a revised version of Hitler’s notorious claim about the “big lie” technique, although Hitler, too, was not claiming it to be his policy, but rather accusing the Jews of Vienna of the tactic.
Sowell is normally a careful scholar, so it is disappointing to find him citing Goebbels inaccurately.