Low. The hackers are likely European, since there are telltales like European number formatting ("10.000.000$") and awkward phrases like "make a step forward" (perhaps Italian fare un passo avanti?).
Hypothesis B: There are North Korean hackers who have mastered English, an enemy language whose speakers they have almost no interactive exposure to, to such an extent that they can, in real time, simulate the subtle mannerisms of another, completely unrelated set of non-native speakers of English.
Take your pick.