He's not 11.
He was on his preschool "tour the elementary school" trip with his mommy and mommy's bestest man friend while daddy was at work. He managed to type the message much like he does at home, by smashing the keyboard.
I mean, just look at what tv shows he watches:
http://fm.cdpa.nsysu.edu.tw/fun/fun02/FM043_newyork.wmv