Mark Kislingbury achieved the Guinness record using a stenotype machine, which uses a keyboard originally designed by Ward Stone Ireland nearly 100 years ago. Here are links with more information:
Gregory Arakelian (USA), of Herndon, Virginia, holds the Guinness World Record for a standard keyboard
(i.e. QWERTY) (- possibly a Dvorak?). He set a speed record of 158 wpm, with two errors, on a personal computer in the Key Tronic World Invitational Type-Off. He recorded this speed in the semi-final, in a three-minute test, on 24 September 1991.
Mark Kislingbury of Houston, Texas, USA holds the Guinness World Record for using
the Dvorak Simplified Keyboard a stenotype machine. The National Court Reporters Association speed and real-time champion achieved 360 words per minute with 97.23% accuracy, at the NCRA 2004 summer convention on 30 July 2004. QWERTY‘Standard keyboard’: 158 wpm, DvorakStenotype: 360 wpm.
OK, perhaps his accuracy wasn’t that hot, but Mark’s keyboard must have been!