I know people who've used this technique and had success. A lot of CBT/DBT techniques rub some people the wrong way at first. They seem dismissive but they aren't - it's just away of coping with the stress of the here and now when nothing else is working. If you can get past negative reactions or frustrations around it, you may find the techniques really helpful after some practice. If not, you can tell your T it isn't helping and look into other approaches.