Comment by gwern

They're obviously wrong and engaged in puffery when they claim to be SOTA. Look at http://www.nature.com/mp/journal/v20/n2/full/mp2014188a.html , for example - that was 3 years before and had a similar PGS of 1.2%. Or, if that's too obscure, look at the SSGAC EA2 / Okbay/Selzam et al 2016 (no excuse for not knowing that one), 2 years before, and more than double, at 3.5%.