From the article: Dr. Laura Wilcox, contributing author and associate professor at the National Center for Atmospheric Science (NCAS) at the University of Reading, said, “The climate effects of air pollution are short-lived, while the impact of carbon dioxide emissions can be felt for centuries. This means that the acceleration of warming due to reductions in air pollution is also likely to be short-lived. We will see an acceleration of warming while the unmasking takes place, and then a return to a greenhouse-gas driven rate of warming as air pollution stabilizes.”

So the increased warming should be short lived before returning to normal rates. And it also seemed like they were talking about the polution impacting surface warming, not atmospheric/net warming.