Re: More to the point
Chinese is not a homogenous single language. Different idioms, way of sentence structure (and not applicable here, but vocal patterns) and vocabulary differ highly from area to area, region to region.
(not even counting the dozens of different regional dialects).
Most of this is much more relevant to the spoken language, since the written is the same. Most likely what they analyzed given the areas noted is probably the writing looks like it was written by somebody that speaks Cantonese. Totally different language than Mandarin, but still uses the same written characters.