Sounds like a load of crap to me, lets have some maths to support the claims please.
How many hops do you think represent one end of the chain to the other?
Ever heard of the 6 degrees of separation theory? The Internet is a mesh not a daisy chain.
How do you compensate for a node that has bad lag or off-line for half an hour? Well above any useful block rate.
Let me quote from section 5 of "Bitcoin: A Peer-to-Peer Electronic Cash System" by Satoshi Nakamoto
"New transaction broadcasts do not necessarily need to reach all nodes. As long as they reach
many nodes, they will get into a block before long. Block broadcasts are also tolerant of dropped
messages. If a node does not receive a block, it will request it when it receives the next block and
realizes it missed one"
I have never seen Satoshi claim that 10min was a good block rate, his only mention of 10min in that paper was in an example of how to calculate annual disk space usage of a block chain, obviously trying to make the usage no look all that much.