I am all about keeping it simple I guess not everyone is, I never washed any egg whether it's geckos or snakes and I do not believe washing them would add anything. If an egg is not meant to be it will die and start molding that is simple as that and for those that wonder the eggs surrendering it will not be affected if they are healthy.
I am glad it works for them and their operation if they want to complicate things its fine by me, what worries me is seeing a surge of new inexperienced breeders deciding to do the same because one of the biggest breeder in the country does it, and do it wrong and kill their eggs.