Well, the learnedness as typist is probably not so much of a factor if you consider the setup:

   (b) type the presented word using the right index finger on the keyboard.

That's really one thing that threw me off, when I stumbled upon it: How is this realistic typing?.. Sounds almost like comparing a flute and a piano and concluding the superiority of the former, because the pianist had to play only using one finger at a time?