A tiny bit misleading really: it's only the "first" and "groundbreaking" to Troll airfield, not Antarctica as a whole.
An A340 which is longer, wider and heavier than the 787-9 has been flying down for at least two years now, but to a different airstrip.
The A340 can carry more passengers than the 787-9, and ironically the 787-9 in two-class configuration can only actually seat 290 people.