heres the thing I seriously want to know more about. The white noise generator was circumvented with "a technical solution provided by the Americans themselves."
What technical solution could circumvent white noise??
If it's a single channel white noise generator, then a coherent two-channel microphone setup (using hidden bugs or laser microphones) would already be sufficient to perform source-separation [1] between a single speaker and the white noise. I guess this is why you usually use multi-channel white noise generators, e.g. [2].
[1] https://en.wikipedia.org/wiki/Signal_separation
[2] https://www.spygadgets.com/white-noise-generator-with-6-tran...