I think the wording does matter "50% possible het" /"66% possible het" are terms that make sense.....a 50% het is a nonsensical term since you are ethier het or not.....by putting one word in there "possible" .....you convey the probability that the organism is heterozygous.

When I first started reading about ball pythons my gf used the term 50% het and it confused me...I was like "heterozgous" is a state, you cant be half-way het.....as soon as I realized that this was short for 50% possible het it made sense to me.