Fascinating, Shewmaker, at least to me. I'm not very knowledgeable about the Antarctic, but my impression is it's a whole different and under-studied area compared to the Arctic. The Arctic is a deep sea surrounded by continents and influenced by rivers with temps that don't get as cold as Antarctica and a fair amount of human activity and commercial interest.
Antarctica is more an ice-covered continent surrounded by oceans with a much more forbidding, less studied environment. There are seasonal and multi-year big swings in surface ice that feel more influenced by weather than climate to me. Arctic ice is thicker, ice from the south pole is harder to observe as it's covered with snow and tends to melt from below where it's hard to observe.
I guess I'm not surprised to see NASA say there's a lot we don't understand about Antarctic ice coverage but it was still fascinating to see her data.