Yes, yes, you found one sentence in a report that you could get behind.
By itself, the high temperature found in what is typically the coldest place on earth isn't significant. It is notable, it catches people's attention, which is why the media loves it and why it apparently irritated you enough to respond to Morgan's post. The authors make it clear that the event was outside of what they expected could happen. To them, it's a head scratcher. The event told the scientists they have something unexpected to figure out. Once they do, then they will have a better understanding and better modeling capability. That's how much of science advances.
So, the 70 F upward swing in temperature doesn't prove Antarctica's climate is changing. We don't really need to prove that from one measurement. We have much more than one data point to show that Antarctica's climate is getting warmer along with the rest of the globe due to burning fossil fuels. This is settled science.
"but the arctic sea ice" lulz