Not really. Sounds like this was class of '08, and at the time BackTrack would have been readily available and popular enough for a curious highschooler with a bit of computing background to find. As I recall etercap was built in and I wouldn't be at all surprised if there were tutorials for setting up scenarios almost exactly like what is described.
Even the ARP balancing thing is the kind of too-clever-by-a-half solution a naive youngin' would come up with since it would lead all the nodes thinking each other are the gateway and crushing the network with routing loops.