Why? It's an opinion piece. Thus, it expresses the opinions of the author. You can see more, in a similar style, on their blog:
http://timworstall.com/
The edit at the bottom of the post that was added in an attempt to make the article 'balanced' after Nestle's complaints makes it obvious that it is not just an opinion piece...
Just wondering, why do you use 'their' when it's quite obvious that it's a man?