[jschuur]

The comments seem to back up that the article is from 2001 (so does the copyright at the bottom), but it links to Gladwell's Outliers, which came out in 2008.

What I suspect happened is that the piece has been modified since it was originally published.

[samaraga]

As I couldn't find the date it was published, I deduced it must be written in 2001 from copyright at the bottom, as you pointed out. Also observing the rule everyone does here at HN while referring to old articles, I added the year. Even I have the same feeling about the modification of the article.