I've shot many rounds against Ffudd, and I can assure you he doesn't cheat, most of the credits he wins are donated in prizes to the cc he is a member of.
As for course knowledge, Ffudd did what most of the top legends did and found the way to access the full course before it was released, then spent most of the weekend practicing, taking notes and figuring out the best play to play the drive to and the easiest location to putt from on the green.
We mere mortals can only dream of shooting that low, but it won't happen without a lot of time and effort.
So good luck to all you top legends, may the best man win.