How are you calculating the direction of the stars in the "southern hemisphere"? Most people just refer to star trails because they can't visibly see the direction of the stars just by standing outside at night.

But just exactly "how" are these circumpolar star trails being shot? From what I understand, a camera must have overlaid angles within a wide-angle lens which are stacked for oftentimes a 360-degree panoramic shot.

I have not yet tried this experiment for myself and I am not debunking anything, but I will not simply believe things without evidence, especially when it has come into question.
Unless you have measured the angle that stars are moving and can share your method, or have shot star trails yourself, in one angle without a special lens, I don't see how you can know that stars are really moving in the direction that cameras with multiple overlaid angles are creating. I think those star trails are pretty, but I consider them works of art and not necessarily representing reality.