So this happened:
This trip to the South Pole to film the 24-hour Sun in timelapse was the result of an online challenge. These guys regularly post videos arguing against flat-earthers. Don't ask me why; like honestly I'd rather peel my fingernails. But anyways, a challenge was made - I'm not sure which side started it - but at some point a few flat-earthers agreed that if some hypothetical trip happened where both they and some normies got to stand at the south pole in the middle of local summer and watch the Sun circle the horizon without setting with their own eyes, they would be forced to admit the world really is a globe.
So the normies
made the trip happen.
Now of course the whole reason the flat-earthers agreed initially is because they believed that they were speaking purely hypothetically, that there was no way such a trip could or would ever happen. So they were taken by surprise when they were taken up on it - and they wouldn't EVEN have to put any money where their mouth is, the travel and accomodations would be totally covered! Well, predictably, they started backing out...in droves. In fact only THREE flat-earthers had the guts to stand by their word and go on the trip.
Don't worry, all the other flat-earthers in the meantime have come up with reasons why the 24-hour Sun wouldn't prove anything actually, and have called the three who did go shills/traitors/apostates and all that jazz.