According to this article, rates of depression during COVID outbreak, were 27.5%. So, at least a decent chance this happens by chance? Also they mention worry, perceived stress and loneliness. Did anyone not perceive stress during the pandemic? 50% seems like a pretty low correlation. I can’t read your article because it’s login walled.
https://www.bu.edu/articles/2021/depression-rates-tripled-wh...