it means he posted a link to a video clip on youtube showing him touch typing, fast, and not making any mistakes - hence no backspace. Although you can't see the screen so who knows what he typed. maybe just never touched the backspace and didn't say anything. Who knows?
Burgundy Touchstream LP - QWERTY (Daily Driver) ... 2003-2007
Silver Touchstream LP - QWERTY (In Case Of Emergency Open Box) ... 2005-Present
iGesture NumberPad - Modified (Converted to detachable mini-USB) ... 2005-2006
Silver MacNTouch - QWERTY (In Case Of Emergency Open Box) ... 2007-2010
White External USB MacNTouch - QWERTY (For use with UniBody Macbook Pro) ... 2010 - Present