Can't be that simple. There have been multiple teams now, if they came from say 4 orthogonal directions that would already push this point out multiple hundred km. Even if they all took the same route, there is now the "Amundsen-Scott Station" there, directly on the south pole, with regular flights. Even tourist flights.

Surely those flights have taken various routes to the station and covered antarctica in a fairly dense mesh of lines of longitude.

Edit:
Rough numbers: according to wikipedia "Between October and February, there are several flights per week of U.S. Air Force [...]". So let's call that 50 flights a year for 40 years, 2000 flights.
Now, if those had all flown fanned out, which realistically ofc they wouldn't have, that would put them only 3km apart even at the coastline 1000km from the south pole.

Also a different note, surely there must have been various surveys flown all across antarctica.

I agree with you.

Surely because it is famous, some people have travelled there. So of it was the point originally, it would then have moved away and is now at a balance, not too far away that the area is more frequented, but not too close so it just happens to not be near any of the paths people took to get to point nemo or back.

Was gonna say that too, not even much marine life hangs around there

I was thinking on a map, so height doesn't matter. Walking somewhere is the same as flying over it.

I doubt there's any island larger than a rock that noone has landed on. (For some time people even specifically sought out islands that don't even have vegetation, to mine nitrogen). Anything larger than a km surely someone would have explored more. So points on those islands would at most be some hundreds of meters.

Given how few islands and how much ocean there is, any island is much more interesting and thus more likely to have had someone visit than some comparable location in the ocean without an island.

By population, most humans lived after the bronze age collapse, and like 20%+ after the industrial revolution. We estimate only a bit over 100 billion humans in total.

So really I think you can ignore anything pre-industrial without too much loss. Anything preindustrial humans got to, nowadays many more can get to, so those areas would be densely covered.

But really since a single person can ruin a point, you also need to consider all weird stuff.

Point Nemo, people could have gotten to more frequently since maybe 500 years ago with better ships. To consider would be roughly were sail ships would sail, snd where they could end up with any number of accidents. Then the same for steam ships, and modern container ships.
Weirdnesses would be survey ships for example. Anyone mapping the ocean floor, or looking for resources to mine, will very strategically cover an entire area with lines maybe 10-20km appart. The same happens with survey planes.

And who knows where a nuclesr sub might cross the pacific between various start and end-points.

Finally there is the worst nightmare, explorers.
Your guess for the point: remote hard to get to location.
Consequence: Point becomes famous, 50 people will risk their life to ship themselves to the south pole, the tallest mountain in antarctica, or point nemo.
So anything that has a name and is known to be remote is probably out.