I really don't understand how you can come to that conlclusion, adhiza.
Here is what you said:
Flying from Argentina to Australia OVER ANTARCTICA can only be done on a round earth stupids, not on a flat one, because if you look at the flat world map, you will not see a southern route from Arg to Aus over solid land.
Response 1:Yes, your claim is true. A trans-antarctic flight is only possible on a round earth.
These flights do not occur in real life.
What you said is no different than if I said:
"Flying from argentina south over the ice wall and into the void can only be done on a flat earth stupid, because if you look at a sphere world map you see there is no edge."
This statement is 100% true, but with no evidence to support the fact that it is actually what happens in real life.
Response 2:Yes, there certainly is a way to fly from argentina to australia over antarctica: fly south a couple thousand miles until you're over top of the ice wall, then head due east (or west) until you're south of australia and head due north. You will have flown from argentina down to the ice wall, around one half of the circumference of the flat earth, and north to australia.
This is exactly what you described, a flight from Argentina to Australia, over antarctica.
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Ok, I provied not one but two counter-examples. I guess you don't win.