I believe they're referring to the "Unofficial World Champions" title. Argentina was the first team to beat Spain following the World Cup, thus claiming the UWC title. Japan beat Argentina and hasn't lost since. http://www.ufwc.co.uk/
Unfortunately thats truth of it. We didn't take our chances and we got punished for it. All in all I am very happy with our performance in the AC. When I looked at our squad I was very sceptical of our chances. We exceeded my expectations. McKay was the biggest positive out of the tournament for me.
Unfortunately that's the way it goes. You can't whine when you have opportunities and the other team just happens to make more of theirs. Well done Japan.