I understand that, but the tagging of village or hamlet is determined by the OpenStreetMap wiki guidelines, and TERYT data does not have to be copied exactly to OpenStreetMap. If it is a hamlet according to OpenStreetMap wiki then that is the correct tagging. I would believe that the OSM wiki takes precedence over the source of data, as the official advice for how to tag map features. Perhaps to avoid conflicting tagging methods we could keep the tagging of the villages already changed to hamlets and leave other villages with their original tagging.