I believe the parent comment is referring specifically to the part about sniffing one stream of information using only the observed it has on another stream (as opposed to the part where the radio is connected to a sound card and digitized).

It's an attack on the 'system' (i.e. the money making system) ;)

Not this part. The system doesn't attempt to make it difficult to obtain that data. The monetization part is done with an unrelated encryption scheme.