Why didn't you include MacMurdo Station. It is the largest *community* on the South Pole. It can accommodate up to 1.000 people (probably more) during the peak season of the summer, and does have approximately 153 year-round residents, making it the only permanent community on the South Pole. The fact that these residents have other homes away from the station doesn't change the fact that the station has a hotel, grocer, spa, post office and several pubs, because a community is determined by having a common language, a social organization structure and a geographical location where all of this takes place. That sounds like MacMurdo to me.
Except for Palmerston Island and Tristan da Cunha, none of the others seem truly isolated. In fact even Tristan da Cunha _is_ well connected. And Palmerston has a population created by an Englishman. I would say the truly isolated community is of the North Sentinel Island of the Andaman and Nicobar archipelago of India. Nobody has ever gone to this place and is today not allowed as well because the indigenous tribe there is hostile, shooting arrows and throwing spears at any boats that venture. That tribe has been living there for God knows how long. I would say this is the most isolated community. Completely indigenous with no contamination by any Englishman or _anybody else_ !!! In fact some people who were successful in landing in the past have not returned alive.
About a year ago I watched a documentary about this 12:56 place, or it may have been a sister village to this. Very dangerous life. I commented.. please somebody tell them that it’s much nicer if you migrate south.