Yes a double het animal is from a two different simple recessive homozygous animals bred together. A possible double het could have come from normals bred toether; for example, if someone bred two possible hets together and both were actually normals. A possible double het could have the product of two hets bred together. I personally wouldn’t buy possible het anything, but there are a lot of other breeders that will. If I am going to spend my money on a genetic animal, I want to be sure that my animal is genetic. It does cost more, but always pays off I the end.