There’s an interesting thing in this review of what looks like a very impressive whole Antarctica package for FSX - https://www.mutleyshangar.com/reviews/tim/antx/antx.htm
In this it says although it has the whole Earth too it’s still actually done as flat tiles stitched together. The closer you get to the poles the more compressed the tiles become until you just get radial spokes right at the end.
That’s what I saw at the South Pole in this too.