Let's dig in!
The geographical conditions of each region are very different.
It's not simply a matter of ice decreasing in the Arctic is making its way to Antarctica and freezing. Arctic sea ice is declining deeply (4.1% per decade). Antarctica ice has been relatively constant, though increasing slighty (0.9% per decade).
You can go to this link, right hand side, and see a graph of Arctic monthly sea ice over the decades and Antarctica monthly ice over the decades. It's obvious that the loss of one is not accumulating in the other. And recall from the link describing the geographical conditions, above, that Arctic ice is generally thicker than Antarctica ice, so if the Heartland Institutes