There are only 5 data points! Remove 1 and that is ignoring 20% of the data. It is a ridiculously obvious way of biasing stats to make a point stronger.
Everyone needs to calm down, a question was asked, i.e. "why remove the year", I answered, it is a standard practice "In statistics, an outlier is an observation point that is distant from other observations."
You make a point that then the scope of data is insufficient, people can chose to agree or not. I could argue that it's not 5 data points, but 5 groups with 38 data points each (individual games), plus the comparison data of previous years. The argument could be made that including (the point of outlier removal) the 20% biases the data in exactly the opposite way
What that data shows for me is Poch did have a truly exceptional year, but the remainder were not the miracle/overperformance it is sometimes made out to be, but again opinions