Thanks for the clarification!

Yes, we've been watching this "warm up" in the upper stratosphere, also seeing it to some extent at 10-hPa. Because the polar vortex winds have been so strong recently, the warming and weakening of the stratospheric westerlies would bring the winds back to near normal conditions. Sometimes these events do start in the upper stratosphere, but not always. It's not related to the increased ozone levels from last summer/autumn.