Not exactly two rudders. Actually, the rudder is split vertically into a main part, and a trim tab part. With two wheels to be able to turn and trim each part independently.
Yes, this builder certainly did have some very different ideas, but that has always been the case with independent boatbulders over the years.
I have seen a lot of different ideas incorporated on Westsail hulls, but I will have to say this one is the strangest one of all. (so far anyway)