no, he refers to the did you know... part on the page :)
Quite interesting research approach. Maybe its time to contest the longest left hand written sentence.
BTW, OS X's dictionary (/usr/share/dict/web2 - Webster's Second International, 234,936 words) is more complete than Linux's (and doesn't contain plurals!) :)
aftercataract
devertebrated
gazetteerage
reasseverate
terracewards
tessaradecad
tesseradecade
For the right hand, on Ubuntu:
grep '^[yuiophjklnm]\{9,\}$' /usr/share/dict/words
polyphony
Anything longer on OS X?