GUIDELINES FOR MOST POWERFUL DISTRIBUTED COMPUTING NETWORK
1. For the purposes of this record, a distributed computing network consist of
clients and servers connected in such a way that any system can potentially
communicate with any other system.
The mining nodes do this by uploading and downloading blocks to/from each other. Any transaction that one node receives will be communicated to every other node. Any node that finds a block meeting the proof of work conditions will have their block communicated to every other node.
That's not even relevant. It says "[...] clients and servers [...] can
potentially communicate with any other system.". "potentially" means - they don't have to, they just have to be interconnected. And, being connected to the internet, that's a given.