To my impression, these findings don't in any way contradict AGW findings, rather give more detailed insight in local glacier growth and retreat in history. (realclimate.org)
Lead author Nicolà ¡ s Young, who worked on the study as part of his PhD at UB and is now a postdoctoral researcher at Columbia University's Lamont - Doherty Earth Observatory, says, «It's not at all amazing that a small local glacier would grow in response to an event like this, but it is incredible that a large ice sheet would do the same.» (earthtimes.org)
Temperatures were substantially lower, and local glaciers formed on the highest peaks. (britannica.com)