You caught me, I never read any of your posts. So, you're saying that you are NOT an FEer? Then why do you subscribe to this whole ice wall theory?
Nope, I'm not an FE'er.
Also, how can the earth have started out covered in ice and, as the ice melted into water, land was revealed where the ice once was?
We never know why the Earth was covered with ice. You might as well ask, "why is there have to be a Big Bang in the beginning of the universe?". Trust me, you will never get a full, well-explained answer. It is just how theories use theoretical explanations to make concepts more sensible, like how the Big Bang is consistent with General Relativity and explains why the universe continues to expand. Yet, there are doubts of its existence. Hence, it is a
theory.
If global warming melts all the ice of Greenland, the rocky layer that was under the icy surface will be revealed, right? Now, where does the water go? Into the open spaces such as oceans or gaps (forming lakes and rivers). This is same as the flat Earth model.
If the water didn't sink, where did it go? How can land exist above water if it was beneath ice just before the ice melted?
You said water sinks inwards. Therefore, I corrected you. Water doesn't sink inwards; the water left by the ice fills up the spaces left by the contraction of ice and gaps of the rocky layer.
When the icy layer melts, the water fills the opening gaps and spaces. Hence, land is revealed. This is like the RE model: why are there oceans? Because there are large gaps for them to fill. The rocky layer of the flat Earth has large gaps. Remember, the melting starts at the center. Heat from the sun converts some of the ice into water vapor directly. Some liquid water are also converted into water vapor. The hydrologic cycle dominates this.
Here is the side-view of the process (with the hydrologic cycle):
1. The icy flat Earth.

2. The ice at the center melts into liquid water. The water spreads by a force known as the Hydrolical Force (Fwater).

3. Ice continues to melt and water continues to spread. At the same time, sublimation occurs.

4. Ice continues to melt and water continues to spread further. Sublimation continues.

5. Ice melts and water spreads. Evaporation makes progress.

6. The melting process stops near the edge. Condensation occurs.

And the cycle continues...
Now, do you understand?
Clearly, I'm having a hard time understanding your posts as they seem to contradict the ideas that FET put forth.
It's just my theory of how the flat Earth forms.