[jpdoctor]

Sorry, I don't see where they are generating random noise or keywords from your link. The link seems to be discussing the merits of a relay of existing traffic.

[cmpctyd]

Relaying 'existing' traffic is the "random noise". It provides obscure, 'random' traffic between nodes but serves a purpose by providing bandwidth.

The content of this traffic could easily be a useless packet, IRC, HTTP, etc.