Actually I might be one of the original promoters for a new push in favor of using het for co-doms. I believe that heterozygous means having an unmatched pair of genes and applies perfectly to say a pastel with a pastel mutant copy from one parent and a normal for pastel copy from the other. Understanding that a pastel really is a het you can see why it has a 50/50 chance of passing the pastel mutation to each of its offspring.
It's using “het” for combos of different mutations that I'm finding confusing. Which is het for bumblebee, spider or pastel? I think a het pewter, crystal, super stripe, karma, or any other combo would be an unclear term.
I did see a discussion about a "super pewter". I guess since snake people made up super we can evolve it to mean whatever we want but I'm not so sure about a super of a combo. This animal was supposed to be both a homozygous pastel and a homozygous cinnamon (or black pastel, don't remember which) so I guess if anything is going to be a super combo that would be it.