This is hilarious. Your "proof" is a picture of the "ice wall" (glacier) taken certainly by a government agency.
Why can't anyone answer this?
If this is the ice wall, WHERE ARE THE SNOWMOBILE MEN?
? No one is stopping anyone from going there.
Also FE say the atmosphere is held in by the ice wall. ummm I can clearly see clouds above the ice wall. Magic energy doesn't count.
You lose.
No.

The ice wall is pretty well-defined as corresponding to the coast of Antarctica. Nobody disputes that the coast of Antarctica exists, therefore nobody disputes that the ice wall exists. If you ask for a picture, that's all we have to show you.
Most people here don't believe that the ice wall is actually guarded and I believe its presence in the FAQ may even be a joke too subtle for some REers to pick up, like the notion that the earth is on the backs of four elephants and a turtle.
PROOF OF THE ICE WALL:
The ice wall is a wall of ice and rock that surrounds the earth to the south. It is not a literal "wall". I'm only pointing that out because the distinction seems to trip some people up. It is only a wall in the sense that it is a barrier.
No matter where on the surface of the earth you start, if you keep going south you will eventually come to a barrier of ice and rock.
Nobody, RE or FE, disputes that this last is true. So there you have it, proof everybody can agree with that if the earth is flat there must be an ice wall.
There is a hypothesized "greater ice wall", but since it has never been observed it's little more than a flight of fancy. Some feel that it must exist to hold in the atmosphere; my personal opinion echoes Engy's, that the DEF, or UA, is all that's necessary to hold in the atmosphere. Personally I don't feel it's terribly zetetic to even hypothesize such a wall but some established FEers disagree so it's become something of a corollary to the overall theory, but one that nobody disputes has not been proven.
But as far as providing evidence of the ice wall that is mentioned in the FAQ, well, lots of people have been to "Antarctica", right? So I don't think any REer can really properly dispute it.