It's a bit stronger than "psychologically dissatisfied" I'm afraid. But you'll be happy to know that the international standards of care for transgender patients require two mental health professionals and a general practitioner to have "bottom surgery".
I can fairly easily understand being dissatisfied with the results of GRS/transition. It's not necessarily going to gain you social acceptance, and if you really want to be female, there's still going to be a lot of things denied you. But I suppose the point that you might be able to clarify, were these people detransitioning because they no longer wanted to be female, or were they detransitioning because they no longer wanted to be a transgender female? Because I do think that we should probably draw a distinction between the two. At the least, I know a few transgirls who are pretty, but obviously transgender, and perfectly happy to be that as something good and complete in itself.
So I think the way I would describe being transgender would be something like, if you had a button to push that would give you your ideal body, that body would have opposite gender characteristics. There are a lot of ways that reality might not match that ideal, but it seems strange to me that the ideal would change. Body dysphoria is hell, straight up, and I really hope there aren't too many people unlucky enough to experience that from both sides. For me suicide would be pretty automatic at that point.