Here is Trump from Saturday's presser: "The, uh, lights of Caracas were largely turned off due to a certain expertise that we have. "
There is a 100% chance that he is referring to a classified capability. It is not a major breach, because anyone watching closely would see we did it, and Trump does not get into how. But still, it was jarring for a president to just throw out that information, and refer obliquely to a "certain expertise" as part of his bragging.