They simplified the explanation a bit too much in some places and lost details in the process.
I think this is the kind of connectivity that works in places with no other connection, like a village on top of a mountain, an area with long term power outage, places where internet is censored, etc. Some of these cases come with a risk to the courier. The couriers could be for example the regular buses connecting that place to a hub with internet connection. The equipment on the bus "caches" your requests or replies, takes them to the connection hub where it picks up whatever comes back.
I think this is the kind of connectivity that works in places with no other connection, like a village on top of a mountain, an area with long term power outage, places where internet is censored, etc. Some of these cases come with a risk to the courier. The couriers could be for example the regular buses connecting that place to a hub with internet connection. The equipment on the bus "caches" your requests or replies, takes them to the connection hub where it picks up whatever comes back.