alt Hacker Newsrephrased for ease of interpretation - venting about a problem is nice just as stretching a muscle is nice. stretching doesn't fix the root cause of muscle soreness though, just as venting does nothing to fix the issue. emotionally re-reacting is likely to result in strengthening of existing associations, which is more likely to cause repetition of a problem scenario, as opposed to leading to scenario avoidance.
"talking about your mental health" does not mean re-parroting your trauma. there's understanding, re-framing, forgiving, all kind of other things that go beyond the limited belief that talking just calcifies trauma.