I decided to check the maps. One of the biggest whines we’ve heard about Antarctica is the Pine Island Bay/Pine Island Glacier region.
My best guess is that these volcanos are somewhere in the neighborhood of 1800-2000 miles flight distance away from that region (starting somewhere south of South Georgia Island, which is off the SE coast of S. America). Pine Island Bay is to the west of the prominent peninsula sticking out from the Antarctic continent... and that’s SW of the S. Sandwich Islands.
Next question: would ocean currents flow in that direction so that the water temperatures could at least have the possibility of being raised by active undersea volcanos? The answer seems to be “yes”, though some of the flow maps I checked are either (a) in conflict, or (b) a little location dependent. But is does seem that there is an East-to-West flow around Antarctica.
Certainly if the GW crowd is up in arms about single degree temp changes, this should be investigated... except they won’t because it would totally invalidate their religion if true.