Volatility is how much the sprint changes. Sure you can pull one 5 pt ticket out and add in a 3 point and 2 point, but if you do that 12 times in a two week sprint, we will not finish the sprint even if total capacity stays under 40 points.
I would snapshot the sprint each day, so each day I could see how many tickets got removed/added. The end result being I could show my manager, look, when volatility is low, we almost always finish the sprint. When the volatility is high, we don't, it doesn't matter if we are over/under velocity because we don't have the time to properly plan and get clarity on asks. Have our product team think more than two weeks out and we'll deliver. That worked to a degree.