As the NB post points out, the list is a somewhat idiosyncratic one, with notable and questionable omissions. There are also problems of geography (where is Scandinavia?). And there's an interesting feature:
to the extent the list can be assumed to tell anything – old Nordic sagas and writers like especially Sigrid Undset, but also Rolvaag, Hamsun and Ibsen seem to be selling quite well in the US.
