No worries! It seems that each case requires some investigation to be sure. Good sources include references in Wikipedia, the SCAR Composite Gazetteer, the Antarctic Treaty Society website, and everything else in this article: https://wiki.openstreetmap.org/wiki/Antarctica/Data_Sources

I've compared data sources more extensively near Villa Las Estrellas, but LINZ only covers this area, so it's hard for me to know at the moment if the data had issues or if there was a mistake during the import. Perhaps it's best to continue checking each case separately, there don't seem to be many cases.