I have not heard about this case.I don't know. Slalom skier Felix Neureuther was famous for always choking in the big competitions even though he had the genes and the training to be really good technically. And suddenly he became a winner. I think he did autogenic training. So there seem to be cases, where it is definitely some kind of mental blockade.
However, in biathlon, we had an athlete who had an extremely successful season. When he was asked about the reason of his success, he admitted that he was training with his psychotherapist. Which meant that the therapist traveled with him and before every race they booked a room for two hours in the nearest hotel and asked the staff not to disturb.
Journalists loved this story.
Conclusions? Whichever way you decide to go, you need to invest in it, like, really. Then it will pay off.