The authors also seem to have a poor understanding of georgraphy. According to the SUPP tables, they have included the Greek samples of Behar et al 2013, who are from Thessaly and Central Greece, in their Northern Greek cluster, alongside the self-reported "Greek" customers of GENO 2.0. Their "Peloponnesus" cluster is made of only samples from GENO 2.0, and that would explain why it is so different from actual Greek Peloponnesians of Paschou et al 2014 and Stamatoyannopoulos et al 2017.