Ocean acidification tipping point, climate change tipping point, rose of wars and fascism, microplastocs - these are just facts of things that are happening. I feel like doom scrolling would be an exaggeration of things that are happening or will happen, not just reading about reality.
I take the expression more as a warning to control it so it does not impact my mental health too much. Getting (properly) informed is good, but if I get so depressed that I can’t act positively on the system anymore or I make it worse for me and others, then it becomes counter-productive.