The x-ray shows injuries to the right wing in the joint at the radius (note the brighter area in the joint closest to its head). When a joint is dislocated we call it a luxation. If it is only partially dislocated (meaning it pops in and out) then it's a subluxation.
This is a full luxation and it is non-treatable. There's nothing that can be done to permanently resecure the joint together while still giving the bird the range of motion it needs to fly.
Note the difference in the joint on the left side of the x-ray to the joint on the right. If you look closely, you can even see the feather shafts on this x-ray!
Luxation is one of the most difficult things to explain to people who have brought in injured birds. The bird may look and act completely normal in the hand, but just can't fly. Finding a way to explain to people why something that sounds as simple as a dislocation cannot be fixed is hard. The most common joints that we see with luxation are the shoulders and elbow (like the kingfisher) and then the hock (in the leg). Luxation is caused by a traumatic force to the joint.