They could be causal, but the effect the parent described is real that messes up the data. Mental health has become a thing that’s allowed to be talked about and taken seriously in literally the last few years. It’s a massive and extremely positive societal shift that shines a light on how absolutely awful school is even in non-pandemic times. I had severe depression in my teens and it wasn’t until I tried to take my own life that the adults in my life at the time even acknowledged it. I had friends at school who were cutting themselves, emotionally dependent on weed, drinking themselves to blackout every weekend, starving themselves to death, throwing up in the bathroom, and studying/working themselves to physical illness because of lack of sleep. Nobody cared.

There is no doubt that that the pandemic is making things so so much worse but there’s also a danger in scapegoating it and then being collectively “shocked” when it doesn’t get better when things go back to normal.