Well this is a semantic and socio-political question and not a scientific/medical one, but ok. Generally, the term there was "antivaxxer" and referred to people who were vocally opposed to vaccines, or in some cases who those hadn't had their children undergo the usual course of routine vaccinations. In a few cases it was even applied more broadly to people who were simply opposed to mandating childhood vaccinations to attend public school, regardless of their own vaccination status. This is all clearly a completely different category from the 2021 incarnation of "the unvaccinated."