Literally from the article if you had read it:
"“At this staffing level, more officers will be forced to work excessive overtime, which in turn will accelerate attrition,” Nguyen said in a statement. “We cannot meet the needs of our community without forcing officers into more shifts.”
It is true that OPD is severely understaffed by hundreds of officers. Mayor Barbara Lee is attempting to shrink the staffing gap, with plans to increase the number of officers. "