Sony's PR is a mixed up soup of physical, transport layer, and protocol layer. The original press release said a Gigabit Ethernet line was used for simulation. Does that mean they put RJ45 connectors on a truck-sized spool? That wouldn't be Ethernet anymore at that length. I'm pretty sure naked TCP/IP doesn't beam itself through space either.
I imagine that getting TCP/IP through space is far easier encoding than ordinary household WiFi.