Can you answer using your own words rather than linking to a 44-min video?
The problem with this video are MANY...but 44 minutes is a lot to watch and comment about.
Firstly - the antarctic treaty - BELOVED by Flat Earthers because they claim that it makes it illegal for ordinary people to go there...conveniently preventing people from reporting back on it's properties. The Antarctic Treaty does NOTHING OF THE SORT! It's actually the exact opposite of that. It GUARANTEES that no one country can 'own' any of the territory - and GUARANTEES scientific access to the entire continent for anyone who wants to go out there and prove that the world is flat...or not. So the "you can't go there" argument is a flat out lie...it only takes you 2 minutes to Google the treat conditions...heck, I'll even do it for you:
Here are the articles of that treaty:
Article 1 – The area is to be used for peaceful purposes only; military activity, such as weapons testing, is prohibited but military personnel and equipment may be used for scientific research or any other peaceful purpose;
Article 2 – Freedom of scientific investigations and cooperation shall continue;
Article 3 – Free exchange of information and personnel in cooperation with the United Nations and other international agencies;
Article 4 – The treaty does not recognise, dispute, nor establish territorial sovereignty claims; no new claims shall be asserted while the treaty is in force;
Article 5 – The treaty prohibits nuclear explosions or disposal of radioactive wastes;
Article 6 – Includes under the treaty all land and ice shelves but not the surrounding waters south of 60 degrees 00 minutes south;
Article 7 – Treaty-state observers have free access, including aerial observation, to any area and may inspect all stations, installations, and equipment; advance notice of all activities and of the introduction of military personnel must be given;
Article 8 – Allows for good jurisdiction over observers and scientists by their own states;
Article 9 – Frequent consultative meetings take place among member nations;
Article 10 – All treaty states will discourage activities by any country in Antarctica that are contrary to the treaty;
Article 11 – All disputes to be settled peacefully by the parties concerned or, ultimately, by the International Court of Justice;
Articles 12, 13, 14 – Deal with upholding, interpreting, and amending the treaty among involved nations.
Now - which one of those says we can't go there? None of them! In fact - it actively allows it. If you say "I want to go to the South Pole to see if the Earth is Flat" - then (as a scientific investigator) - nobody can prevent you from going there. Just don't take any weapons, radioactive waste or atom bombs - and you'll be welcomed. Of course GETTING there - and not dropping dead while you're there - that's a harder problem...it's **NOT** the treaty that stops you going there.
The other issue - of the sun setting or not setting.
The earth's axis is tilted - which mean that the only time the sun goes around in a neat circle (above the horizon) is in mid-summer (December - because it's in the southern hemisphere). In June/July, you get perpetual nighttime - but through the rest of the year, the sun DOES rise and set.
So - all our intrepid videographer did was to set his "astronomy" program to December (note - perpetual sunlight) and pick a time lapse video made...oh! Really? October? Well...guess what...the sun does set in October. Because the Earth's axis is tilted.
Sorry - 3/4's of an hour just to make THAT stupid elementary mistake? Really?
Good grief.