Is it not the same guys that claim that they created bitcoin but they were not taken seriously by the community. If they the first billionaires, then good for them but if by multiplying the amount of the alleged coins they own with the value today and then say they worth a billion dollars, then that would be wrong because there is no evidence to proof that they actually have that amount, there is also no way to  determine if they have not sold a large chunk of the bitcoin they have, and they would only worth that amount, if they sell today which is obviously what they are not doing. In short, they are unrealized billionaires and can turn to millionaires before the end of the week.