Not me personally, but my golfing mate, had the same problems as you and swears by his Pin guru…...but he retired recently and now my mate is lost, as he won't go to anyone else, and now going to a physio, which is not as good fixing the problem
Has it been an ongoing thing for some time with your mate?
I suppose with golf it keeps recurring, one of the suggestions for recovery is to stop doing what causes it, in my case it was a simple knock on the elbow, but my work is physical and also doesnt help it I guess.
As an avid 3 times a week tennis player, I suffered severe tennis elbow. I tried everything, but there was only one cure - I stopped playing. It's been about 8 years now, and I'm ready to get back into it and try again.