Yes, but this researcher's field is body image and weight stigma, not mental health issues. In the paper that appears first if you google-scholar her name, she writes in the first sentence of the abstract "Weight bias [or the stigma towards and negative stereotypes about individuals who have large bodies] is a form of stigma with detrimental effects on the health and wellness of individuals with large bodies." So making people thinner will actually improve their health and wellness.

If she's worried about other negative outcomes, such as people not being able to afford the drug, she should say so. It might be an editorial fuck-up on Nature's side, of course: they just want to print some soothing words to demonstrate their neutrality.