That statement doesn't make any sense. No matter how many twists are in the bar/stem, your hands are still a fixed radius from the head tube. That means they turn in a circle.

My bullhorns are pretty wide, wider than the drop bars that were on it. Slight left-right input cause pretty big swings. I have to be very deliberate which my hands when I come out of the saddle.

This link describing tiller effect seems to agree with what I said

https://crosscountrycycle.wordpress....0towards%20you.

Interesting the weight shift aspect. That probably explains what instinctively control with my stretched out handle bars.