Thank you for your suggestion. We researched more literature on the subject and adopted a more moderate perspective for assessing normality (|Sk|>2-3, |Ku|>7-10 and |KuMult|>10). As you mention, with the elimination of the extreme values, the skewness and kurtosis values improved significantly, approaching the range -1 to 1.
In lines 391-395 I would prefer an Sk and Ku between -1 and 1. You have some values that are not included in this interval - maybe because of the outliers from the figures above that I recommend to exclude.