I think you're focusing on the wrong sentence in the cited article. It goes on to say: > International modelling studies which estimate that school closures ha

I think you're focusing on the wrong sentence in the cited article. It goes on to say: > International modelling studies which estimate that school closures have a meaningful effect on reducing transmission rates are all confounded by the near simultaneous introduction of multiple interventions (including lockdowns, curfews, closures of bars and restaurants). Moreover, they do not account for indirect effects of school closures which prevent parents from working outside the home. A systematic review of observational studies showed that in those studies with lowest risk of bias, school closures had no discernible effect on SARS-CoV-2 transmission. The title of the cited article is "Closing schools is not evidence based and harms children", which I think gives a pretty clear picture of the researcher's conclusion. And that in turn matches what the New York Times wrote: "Some researchers are skeptical that school closures reduce Covid cases in most instances."