It is in English. Thus to call it an "English article" is both grammatically and factually correct. However it would have been less ambiguous to describe it as

It is in English. Thus to call it an "English article" is both grammatically and factually correct. However it would have been less ambiguous to describe it as an "English-language" article, if the GP's intent was to contrast geopolitical thinking from the Anglosphere with that expressed in, for example continental Europe.