Just so you know, I don't think they're selling the three adults on the top row, just the available offspring. And none of the babies appear to be pied.
It kinda bothers me that all of their snakes are shown balled up and on shavings. Shavings generally aren't good substrate, and balling up is a sign of stress.
I'm sorry, but I don't understand what you mean by your last post. You don't think what says what? In order for a recessive gene to become apparent (like a piebald), two recessive genes must be paired. This is about a 25% chance when breeding two heterozygous snakes.
From the website I sent you:
This means that all the snakes hatched will look normal, but will carry the gene for albinism. This is called being Heterozygous for Albino. Each snake hatched will have a 100% possibility of being Heterozygous for Albino (4/4 = 100%), or 100% Het Albino as is commonly referred to in the pet trade.
By 100% het, they mean the snakes are absolutely, positively 100% Pp genotype: bred with another Pp, they will produce most likely a PP, 2 Pp and a pp (pied) in their group of babies, or around that percentage.