Well I'd love to know on what basis they are making this claim. Forbes (who are the world accepted experts not this) note it's hard to estimate his wealth due to poor intelligence of Russian companies. Any estimates they give would have to downplay his worth because of this. Saying that they attached a value of 1.9 billion to the portfolio they are aware of and acknowledged this was a "conservative estimate". So a cautious under estimation of part of his wealth is around 2 billion. Once you stick that through the kopite calculator it gets churned out at 1 billion. Outside the world of little red fairies, N word being an affectionate term and gegenpressing the figure would be substantially higher. As with all things, people can choose what to believe.