In 1990 Sunset annual I found another poached fish with cream sauce recipe
This one is just called Poached Fish with Cream Sauce and is not specific to salmon but suggests it. Poaching liquid has ginger, chicken broth, white wine, butter, shallots in it. After poaching the sauce is made with pan juices and whipping cream reduced down.
Is this one it? Again, if so, I will type it out.