Well, it's not really a question you're asking since there is no question mark, but I get your drift now.
I wish I could tell you. Sadly, the Antarctic Treaty precludes independent investigations/expeditions.
You need to ask the government and its scientists what's beyond the ice sheet...and you know you can count on them to tell you the truth.
If I follow your theory correctly, Antarctica is a ring that circles the outside of the Flat Earth disk. That means that you can (and will) reach it, no matter what direction you travel, across the surface of this world.
Following your weak excuse, it would seem that no people in the last ten thousand years ever ventured into the Antarctic interior, and no one ever left a written record, because of a treaty that wasn't inked until 1959.
Well, surely there are photos and even video of this ring of ice, taken from multiple space missions in modern times. But no one's ever seen such photos and video, which in your mind, can only mean that the government is hiding the truth from us, because...
Yes, this is where it gets hard, because you have to come up with a plausible explanation for such deep secrecy, that passes the giggle test.
Now, I don't really expect you to provide a logical answer to that question. I expect you to evade it, just as you've evaded all the other questions I've put to you on this thread.
Enjoy your fantasy, friend. It's been amusing.