Understaffed elder care facilities lost 175,000 residents to Covid, then laid off 12% of workers. But their landlords are doing $well. When Covid-19 began exterminating everyone around her a year ago, Gloria Duquette thought Genesis Healthcare did a pretty okay job. The biggest nursing home chain in America owns one of the three senior care facilities in which Duquette works as a nursing assistant, and Genesis was the first to give…