A Corded Ware-related Proto-Greek from the Pontic-Caspian steppe?

The recent Wang et al. preprint on the genetic prehistory of the Greater Caucasus features several supposedly already published ancient samples that, as far as I know, haven't yet appeared anywhere. These include five Yamnaya samples from Hungary and two Neolithic samples from Greece. I'm guessing that they're part of a paper that was scheduled to be released earlier this year, but was delayed,