I've reached out to breeder referrals, and rescues in your area. I can't find one single person that knows anything about them. That's very strange as the vizsla community is a very tight knit group.
If he has been involved with vizslas for 40 years, someone should know them.
Is it possible he changed his kennel name?
While I was asking, I did hear of another kennel to stay away from. You can send me a private message, if you want the name.