Why is anyone even talking about the controller?
The controller asked the helicopter pilot if they had the jet in sight. The helicopter pilot said yes, and the helicopter pilot requested permission to maintain visual separation from the traffic. The controller granted that permission. The controller continued to monitor, and again asked the helicopter pilot if they had the jet in sight. The helicopter pilot again informed them that they did, and again requested to maintain their own, visual separation.
Responsibility for this collision is on the helicopter pilot, not the controller.
Sorry, you don’t get to post a piece that implies the fault is on the controller, and then argue that it is “extremely premature” to make any other conclusion.