And while this thing doesn't really meet that label at its present scale, it is conceptually far closer to those early supercomputers than what an iPad is, both in how it's structured, the parallel nature of it (16 ARM cores; 128 Epiphany cores), the shared memory (within each Parallella) etc..
So yes, you're being grumpy about a title where it takes about 10 seconds to figure out that this isn't actually about someone building stuff aiming for the Top500.
The Parallella brings distributed-memory programming in, which is a very important development.
You and I strongly disagree on the meaningfulness or definition of the term supercomputer. Here's an easy definition: A supercomputer is any single, unified, computer system that is currently one of the fastest 500 in the world.
Give the man a break, wait a couple of years and he'll give you a 4K core cpu supercomputer for little money, that needs to be encouraged, not talked down. It's early days.
I think the metric of it being one of the fastest 500 in the world is a little disingenuous to all of the other supercomputers out there.
The cylinder design he's using is inspired by the early Cray models. Cray 1 had a performance of 80 MFLOPS. Cray X-MP had a performance of 800 MFLOPS. The Cray 2 (which looked substantially different) reached 1.9 GFLOPS in 1985.
1993-1996, Numerical Wind Tunnel - a 140 CPU vector computer, was at the top most of the time. It reached it's all time peak at around 235.8 GFLOP/s
Even ASCII Red, which held the top spot until the end of the 20th century, only reached 1.3 TFLOPS.
So unlike if you built a model of a Ferrari at home, this thing actually substantially outperforms the fastest supercomputers up until the mid 90's.