A Polish luge athlete who was injured during a Winter Olympics training event near Beijing was flown out of China on a cargo plane this week after coronavirus restrictions prevented him from taking a commercial flight, according to the head of Poland’s luge association. The incident speaks to the kinds of complications that could arise at next year’s Winter Games, which are scheduled to begin on Feb. 4 in accordance with strict health protocols. For training and other events in the prelude to the Games, athletes and team officials are…