What puzzles me is those serology studies in Spain and Italy that show that people who were locked down were infected at the same rate than essential workers wh

What puzzles me is those serology studies in Spain and Italy that show that people who were locked down were infected at the same rate than essential workers who were not locked down (except, understandably, for healthcare workers). It seems to be a major data point on whether a lockdown actually has any impact and it seems to have been completely ignored.