Earlier quoted context omitted.
Probably because Snowden is a VIP who has people looking for him (US government, for example). A live stream would be a liability, kind of a breadcrumb trail, potentially exposing his current location.
Doesn't need to be live to reveal location. 2 loudspeakers playing pseudorandom white noise, inaudable from a few hundred yards away, would probably still leak any location in the city, as long as the stream isn't too aggressively compressed. Correlating with a known signal over hundreds of thousands of audio samples has a massive snr gain...
Can that possibly work IRL?