I think in their crazy world, the north pole is at the center of the earth disk and Antarctica is actually an ice wall around the perimeter that keeps the water on the disk. Therefore, Africa and Australia are on opposite sides of the disk (like left-right not heads-tails) or are near the out perimeter and no one would build a cable going across that long of a distance.
If that makes your brain hurt because of the stupidity, that's because it is. Flat earthers are only good as the target of a joke because we can all agree that it's stupid. There are some entertaining videos on YouTube of people making fun of them, or of themselves proving themselves wrong.
Well you see, the UN's logo is actually a top-down view of Earth. Apparently. Because they can't keep a conspiracy secret without leaving some clues in the open for kicks.
many countries mark Antarctica as neutral territory and there are laws surrounding what you can and cant do in Antartica so doing any business move there is probably not ideal unless you want to piss some countries off even if this is objectively going to help countries get better connected.
I've only found one post in which someone points to a map, claiming the lack of undersea cables between the southern pointy bits of land is evidence they're on opposite sides of the disc.
That is 1 too many, unless it all really is a conspiracy, in which case I think they deserve the win just for convincing so many people in so many countries to all keep their mouths shut.
I think a flat earth is actually more likely than that though
Standard map projection strikes again. Starting from the tip of South Africa, it's 4300 miles to Uruguay (where you'd land straight east) and 5300 to Perth, Australia. New York City is 3300 miles to Portugal and obviously the smoothest route to Australia is hopping through southeast Asia. Coincidentally, the northern hemisphere has way more population.
Cape Town is only 34° south. Going to 34°N, you're lined up with Los Angeles, Dallas, and Atlanta USA, then Morocco, Algeria, and Tunisia, then the middle of the Mediterranean Sea, Lebanon, Syria, Iraq, Iran, Afghanistan, middle of China, southern tip of South Korea, and grazing below Tokyo. It's still 4100 miles between Georgia (USA) and Morocco.
There are no southern polar flights and no southern undersea cables because the southern continental points aren't as far south as the northern points are north. Population volume doesn't create the demand for more direct service.