I probably am describing neurosis in general. I agree that language is very dominant in human relations, but it is the least effective tool you have if building trust and rapport is your goal. These group sessions seem to have a heavy trust focused bias. Sorry, I only watched the first couple of minutes and then skipped through so maybe I missed something.
Language is good for misleading people too and creating false impressions and the person with the fast tongue can frustrate the person without, causing all sorts of expressive bottlenecks.
I have interacted with a lot of different personalities over the years, but not in a clinical setting.
From my experiences it seems that people often aren't looking for solutions to their problems when they come to me. They are wanting to tell someone their problems and are wanting to know that the world hasn't changed for having told them. The world goes on and they are still accepted in it despite the trauma they have faced. They are still part of the pack. (They also often want justice)
I find when dealing with people that are extremely upset for instance a big key is to not show a lot of emotion. To listen closely and nod- to show you are listening. Once they have told me their problem they almost invariably look me very strongly in the eyes to watch my reaction to what they've said. If I react like its all under control and in the scope of my everyday experiences (regardless of how much it is not), they relax almost immediately.
You can tell them of course things like, "well that is horrible", or "well let me see if I can do something to make that right for you" (justice), but without too much emotion. You can isolate them with a strong focus of attention, causing them to believe they really do have a problem. - Just you and them in a psychiatrists office for example - they know before they even go in they have a problem, they just don't know how big it is yet. They'll wait for your reaction before they make their mind up on that one.
I love studying animal relations. We all use the same gestures and the same pattern of gestures.
Sounds are important in conveying intent - warm intent or hostile intent, as much as gestures are. Language may explain it a little clearer, may allow you or them to pop the blister of pain.
If I go out into my backyard and there is a bird there, I will look at it- show it that I see it - and then look away and show no interest. All animals do it, including humans. Animals do this to establish you can share a domain with them and vice versa. Its a mutual non-aggression pact: They yawn, lick themselves, scratch themselves and look away - these all show awareness of your presence and a disinterest in threatening you or seeing you as a threat. Tensions are immediately dissolved. Proximity is of course important, but it's never a direct approach unless you know the animal. Smiling and tongue lolling works.
Of course, when they don't do that stuff, you know you're in trouble.
In what I saw of the group therapy session there was a high level of general awareness and disinterest. They responded to each other initially and then showed little interest. The patients would be free to express themselves, be heard and then blend into the group without thinking they have singled themselves out for scrutiny. There is a mutual non-aggression pact in a group dynamic, so, many social disorders would benefit enormously from this approach I would think.
But, I am not trained in psychiatry.