I'm not sure how familiar you are with the flat earth model, but if you search 'Gleason 1893 map' this is the generally agreed upon approximation. We don't believe there is any satellites used for communication in orbit. All communication is through various land and sea cables, and radio/cell towers. Its easy to look up,but nasa also releases 1000s of helium balloon satellites that can stay aloft for 1-2 years. These have various purposes but they can also function as repeaters for communication. Any land in the southern hemisphere is going to be towards the extremities of flat earth, and I would expect any communication delays to be represented in this. Look up that map I told you, but I hope that provides some insite to your observations.

Edit: I can't find a FE representation right now, but if you look at the layout of sea cables between continents, they make far more sense on a flat earth map. The sea cable distances between South America, South Africa, and Australia are far to great to be practical on a flat earth layout. This is why they are all focused in the northern hemisphere.