https://www.economist.com/leaders/2020/09/19/the-ecbs-lack-of-credibility-could-hamstring-europes-recovery

"So concerned is America's Federal Reserve about inflation expectations that it has promised to allow inflation to overshoot its target temporarily to make up for shortfalls, ensuring that inflation averages 2% over the long term."

Can you help me explain this new strategy and if there are other recent changes to the Fed's monetary policy procedure?