Here is the full story. Ralph Davis imported the first platinum, named the morph platinum and he called it the specific animal the platty daddy. He made babies with it. He produced an obvious morph but looked nothing like the platty daddy. So he called them lesser platinum. Years later of trying to figure out how to make platinum, he figured out they were allelic. The normal looking morph got named daddy gene and when bred to a lesser platinum, it could make platinums. We shorten names of everything, now lesser platinums are known as lessers.
It appears the calc is mistaken lesser platinum for platinum.