It is weird that they claim that they could not find outliers in the Iron Age group, considering that even their own Fig. 2 shows them:
https://genomebiology.biomedcentral....13-9/figures/2
https://i.imgur.com/K2MRbtB.png
And of course we were easily able to find these outliers also when using G25 and K36. Are academics using tools inferior to G25/K36?