This is just one of the 70 association studies Haidt cited, but almost all of them suffer from the issues tabulated above. Not all of these problems were in all of the studies, but none of the 68 had a clear, strong result demonstrating above-normal depression levels of heavy social media users based on reliable data and robust statistical methods.
this means that most of the studies that show a negative association have weak results. None of them has strong, definite results that would lead researchers to say that these studies are definitive