Sadly self harm is a very complicated topic. First because its contagious, hearing about it can make it worse for people who already are goingdown that spiral. Secondly, while its answer was not entirely wrong it also is built on s system known for factual errors. If it gave the advice to desinfect the wound with something corrosive it would make a terrible situation much much worse.
For things like drug use I would agree with your view, encouragement to leave, safe information, and reminders of the dangers are good ideas. But in the specific case of self harm, I think the new answer, as dry and almost inhumane as it is, I think its better.