In my professional opinion, there are many, many things wrong with this article.
For starters, the horrific idea that eating a gnome would somehow be a delicious, recommendable idea, or even a healthy choice. That's just insanity.
The other, that Trolls are somehow predators capable of handling Gnomes. Or that humans are, for that matter; at least the notion that a lightly-armed hunting party would be able to handle a Gnome with little difficulty.
Whoever wrote this, whether their heart is in the right place or not, clearly hasn't got a very good level of authentic Gnome Lore. I'd wager that they've never been out "hunting" gnomes successfully with this technique, or likely at all (the proof being that they're still alive, which I think most people who took this article seriously would not be).
RPGPundit