Isn’t it basically the end of summer in Antarctica? How many hours of sunlight is that continent getting this time of year? Something like 18 hours?
It's late autumn in the southern hemisphere, with April corresponding to the northern October. In the extreme southern latitudes, the winter night comes on fast after the equinox. Checking with my "Starry Night" software just now, I set my location for the vicinity of the Wilkins Ice Shelf and found that the sun barely comes up to the horizon at noon, and never actually rises at this date.
Any continuing erosion of the ice shelf would be, I believe, due to the water remaining warm, just as we expect the ocean water to remain warm into October off the eastern Atlantic seaboard.