No. As this article states, Rove offered more testimony in July. A blogger reports (take with a grain of salt but he's being borne out and it makes more sense than the idea Libby and Rove violated any laws) that Rove gave a written proffer back then of his proposed testimony and it involves Matt Cooper.
Well, at post #230 someone linked to the New York Times story and surprise surprise surprise, they say it is indeed about Cooper.
Miller, Cooper....the MSM knew about Plame/Wilson well before anyone in the Admin.