It's both. Obviously, it's a silly April-but-not-in-April fools joke; but it also seems that it would work (but not be practical).
The spaghetti is just a stick. At one end a relay[1] wiggles the strand of spaghetti to transmit information. At the other end an optical sensor[2] sees the tip of the strand of spaghetti wiggling and receives that information. There's such a setup going in each direction[3] so that each side can receive and transmit.
