The locations are taken from the southern hemispheres. Their exact degree below the equator is irrelevant because the point is not where at in the sky the constellations rest relevant to each other; the point is that you can see the same constellations at all. I would love for you to check out the accuracy of the program on your own computer. My cpu was acting funny as I was looking at the pictures. It took a long time to finally get them right, but I'm certain they are accurate and represent the skies from the different locations at the same julian date and roughly the exact same zulu time, give or take a couple minutes.
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Well, as the examples you gave show, if you're in Christiana (South Africa) you can't see the Southern Cross at the same moment that someone in Auckland (New Zealand) can see it. So each city's exact degree of latitude below the equator clearly is relevant!
I get the feeling we're at cross-purposes here, so will drop the subject and wish you well with your inquiries.
I will use a different constellation to make the original point. Look at the lyre on the butt of the centaur. it is visible from each direction. If people hold hands in a circle and all face away from each other, they shouldn't see the same thing.