The data in that article support the opposite conclusion.
The reasoning the article takes to reach its incorrect conclusion is plainly erroneous. For example, it reasons that "Northern latitudes have later onset of winter sunrise and higher prevalence of SAD, with the latter increasing by 0.2% per 1° increase in latitude," ignoring that northern latitudes also have less sunlight overall.
The reasoning the article takes to reach its incorrect conclusion is plainly erroneous. For example, it reasons that "Northern latitudes have later onset of winter sunrise and higher prevalence of SAD, with the latter increasing by 0.2% per 1° increase in latitude," ignoring that northern latitudes also have less sunlight overall.