Breeding an amel striped to an anery striped would not get you blizzards unless both are het for charcoal.
So breeding amel striped het charcoal x anery striped het charcoal and you will get het blizzard striped. Then breeding those together would end up with blizzard striped somewhere down the line.
What you proposed was amel striped x anery striped which would give you striped het snow. Breeding those together would then get you some snow stripes~~
Therefore I don't think that anyone would have produced any whiter blizzards from the pairing you mentioned above (assuming no hets is involved)