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It is confusing because they’re trying to describe the shape. Which is perhaps a distraction really. I’m not sure I understand ‘negative rise’ in this instance.
I would just measure your current setup (from the bottom of the steerer clamp to bar ends) and see how close they are to these.
All that matters is where your hands will be ... and if that matches your current (or desired) setup.
Hope that makes sense.
The stem-part is longer and higher. The bars are swept back and down.
Those measurements are for roughly where it puts your hands (the important bit usually).