Possible Inconsistency with Population vs Sample

[varon]

Thanks for the great article.

in
https://github.com/rubenbriones/Probabilistic-Sharpe-Ratio/blob/master/src/sharpe_ratio_stats.py#L86
and
https://github.com/rubenbriones/Probabilistic-Sharpe-Ratio/blob/master/src/sharpe_ratio_stats.py#L88

You seem to be calculating the population skewness and kurtosis, but in the sr_std above you've used the sample standard deviation (ddof=1). Is this intentional? If so, why?