Not sure what to make of this. It doesn't seem all that well-supported with evidence, nor does it seem to have a definitive criteria for how much the students were suffering. Severe, moderate and no symptoms is a little woolly when the study doesn't outline what it means by that. Nor does it state how many were diagnosed or how many just had some symptoms.
But I agree with the basic premise that freshers struggle most, as they do with everything because of being in a strange and uncomfortable environment until they settle. Alcohol making it worse is a bit of a no-brainier.
Was that the entire study write-up? Or is there a more in-depth report of the findings and methodology going to be published?