Actually, I highly suspect that this is a Rabbit Eye blueberry.
Yes, you are correct. Back when I first wrote this, I typically called any rabbiteye or highbush either a northern highbush or Southern highbush. However, to be specific, I have since learned that rabbiteyes are merely a different type. Which is even more intriguing, as rabbiteyes are not known to be self-fruitful like this one.
So, even better that this one is self-fruitful, and from the looks of it, it's seedlings are proving to keep the same resilience and growth habits.
I will be adding some updated photos of ones I'm growing in containers and how much intentional stress I've put some through. These suckers are tough.