Yeah - pretty sure those fossils are from when Antarctica was farther north, or maybe even when it was part of one of those super continents.
I was at a talk where the gal from NASA was talking about the south pole looking for meteorites. Due to the sublimation (evaporation) of the ice it concentrates the meteorites. She made a joke like “So - GO global warming! Yay!!” (Of course she also had the photo of the thermometer when she was there in the summer, showing -40 degrees or something.
So of course global warming isn’t causing higher temperatures that will cause the ice to melt.
Look, I'm not a geologist. But every reconstruction I've seen has Antartica at the pole during this time. Even when it was smashed together with other continents it was still in the extreme south.
If there's a reconstruction that says different, please point me to it, because I use this argument a lot.
Antarctica has stayed south. The time of forests was not at all contemporary. It was a time so long ago that the atmosphere was much denser.