I think the linked poster is talking about irrational stressors, not ones you can talk yourself out of. Worries that stem from irrational sources sometimes can

I think the linked poster is talking about irrational stressors, not ones you can talk yourself out of. Worries that stem from irrational sources sometimes can't be quelled with rational thought processes. We're more beholden to primordial stress responses than we'd like to admit, triggered by things which make no sense on paper. Social anxiety is a good example. Worrying about deadlines you know you're on track for. Etc. It makes sense that (some) irrational stresses can be quelled by sheer force of will. We have some conscious control over our stress responses, or at least can retrain the way our brains follow up to that stress response. It doesn't work for everything, but it's a good tool to have in one's mental wellbeing toolbox.