It only proves that you can design a test to do stupid things that don't really apply in the real world.
First and foremost, is the fact that memory is everything. In order for a process to write to disk, it must first put that data in a buffer, which is (gasp) MEMORY. In most modern, enterprise level systems, there is a ton of cache (more memory) sitting in the disk subsystem to receive the data from the operating system prior to it being written to disk.
Let's see them run an application or database doing real-world work and see how their theory holds up. I got $100 that says "not very well"