He's Australian, so yeah, he's of British descent.
Yahtzee is a British-born, currently Australian-based writer and gamer with a sweet hat and a chip on his shoulder. When he isn't talking very fast into a headset mic he also designs freeware adventure games and writes the back page column for PC Gamer, who are too important to mention us. His personal site is www.fullyramblomatic.com.
Be inclined to educate yourself in the field of multi-dimensional cognitive process of decoding symbols for the purpose of deriving meaning.
Well if he lives in Australia, which you have pointed out, he is Australian.