Very interesting @chibam ,
I don't know what I can add to the link you shared except for "What this space". I'd certainly be interested to hear any follow-on research.
I personally don't like the term 'treatment resistant' because I feel it means the person doesn't need to hope that things will improve.
For me personally, when I understood the brain activity from a certain therapy, it helped me engage with the therapy better. But that might be different for other people.