23 billion yuan is about 3.3 billion USD at current exchange rates. Since he says "230" they think he means he has just over $30 to his name
Btw if it wasn't clear he says 230 instead of 23 because 23 billion is 230亿 (亿 = yì = 100 million). So it's just him neglecting to say the equivalent of the "billion" part.