Sergeant1107,
Jim Sackett can correct me if I'm wrong, but I don't think he was referring here to the press reporting about polygraph techniques. Rather, in order to construct a proper Guilty Knowledge Test, it is important that a number of case facts not be publicly known, so that these can be used as "keys." For example, in a murder investigation, if it is publicly reported that the victim was shot in the back of the head with a .22 caliber weapon, then such useful keys as the kind of murder weapon (baseball bat, lead pipe, piano wire, gun, or knife) or, for the next question, the caliber of the weapon (.45, .38, 9mm, 7.62mm, .22, or .40), and where the fatal wound was inflicted (stomach, chest, throat, head, or back) cannot be used.
I would disagree with Jim Sackett's bemoaning of an uncoöperative press lacking in social responsibility. The media frequently coöperate with law enforcement and may well refrain from reporting case facts when asked to do so in the interest of helping solve a case.
The main reason the GKT has not gained wider use in the United States is not that we have an unscrupulous press. Rather, it is that law enforcement agencies, including their polygraph examiners, have shown little interest in the technique, which requires considerably more planning and preparation than the CQT.
For a good primer on the kind of preparation that would be necessary to conduct a GKT, see David Lykken's chapter, "The Body on the Stairs: A Pedagogical Detective Story":
https://antipolygraph.org/articles/article-037.pdf