Risks are the probability of loss. But in his example, the returns are all positive. Therefore, evaluating risks is nonsense as investors have no chance to lose money. In his example, obviously, we can just choose the fund with higher returns.
Also, we can see that his return numbers have a thing that upperside and downside have equal distance to their mean. If we set a negative return following Yang's rule, we can find all mean returns are 0, and all Sharpe Ratios are 0.