I would think that a living human would have to be more than 2% fat to even be alive. Now maybe Ohno had been measured for body fat and it gave that reading but that does not mean that is what his percent body fat actually is.
I know that US Olympics/US Speedskating Organizations measure fat and lot's of other things on the Elite skaters. I think that Apolo either misunderstood or misremembered the value or that 2% was not the total body fat number.