I'll let you know; I've noticed the phenomenon but never put it to use myself. I will do so over the next few weeks.
One thing the article isn't clear on: is the author simply staring down the other person (i.e. eye contact with no words), or is he simply maintaining eye contact while speaking to them?
If the former I'd certainly think that's hostile, if the latter... well.
Isn't this a bit of a false dichotomy? There's a middle ground between being hostile and sociable. People playing a game generally aren't hostile but they do want to win. One might want to use eye contact to achieve some end result without wishing the other person ill - which a claim of hostility would connote.
One thing the article isn't clear on: is the author simply staring down the other person (i.e. eye contact with no words), or is he simply maintaining eye contact while speaking to them?
If the former I'd certainly think that's hostile, if the latter... well.