I almost made such a point myself, in the post I made on the subject. This was the essence of what I learned about counter-intelligence when I worked in Europe during the Cold War… “The Noise to Signal Ration must be kept high enough that those without the appropriate filter will have no clue as to what is going on.”
The goal for the Counter-Intelligence agent is to make others think that they have found the correct filter.
Everyone I knew from the Intelligence community in 1987 − 1989 were of the opinion that the Soviet Union had less than 5 years, 10 at tops. Between 1985 and 1989, they had massive yearly increases in the contacts from Soviets either wishing to defect or to pass information about the toppling of the control structures. None of them were people who made yearly predictions about a fall, and every one of them was not happy about the situation (as every one of us lost our jobs as a result). I’d hardly call that noise.