The reason they chose Antarctica is because the most often used flat earth model* has Antarctica as a ring on the “rim”.
They usually do acknowledge a 24h sun in the north existing based on that model because it would require the sun to remain central over the disc, which is geometrically not really an issue. However the southern 24h sun is not possible with that model. (Edit: Excluding some weird lensing effects or multiple suns, like some of them claim)
*Most of them will tell you they don’t have a model, because they don’t really know what “model” means.
The reason they chose Antarctica is because the most often used flat earth model* has Antarctica as a ring on the “rim”.
They usually do acknowledge a 24h sun in the north existing based on that model because it would require the sun to remain central over the disc, which is geometrically not really an issue. However the southern 24h sun is not possible with that model. (Edit: Excluding some weird lensing effects or multiple suns, like some of them claim)
*Most of them will tell you they don’t have a model, because they don’t really know what “model” means.
Source: I watched too many SciManDan videos.
That and “the government” won’t let people go to the Antarctic because reasons.