In short, that’s why the article says “Of course, if you’re suffering from a severe problem you…

In short, that’s why the article says “Of course, if you’re suffering from a severe problem you should seek assessment and treatment from a qualified professional.” If someone has an eating disorder, for instance, they should receive treatment from a qualified professional who specializes in that problem. This technique probably isn’t suited for them but it might be helpful in a handful of cases. It would have to be done at the discretion of a therapist who specializes in this area and under their supervision.