"Distancing, hybrid models, classroom barriers, HEPA filters, and, most notably, requiring student masking were each found to not have a statistically significant benefit. In other words, these measures could not be said to be effective."
No! If you cannot find a statistically significant benefit, perhaps your experiment design is flawed. Perhaps your sample size is too small. Perhaps you have too many confounders. But you cannot conclude the measures are not effective!
It gets better! Read the article. It says:
"COVID-19 incidence was 37% lower in schools that required teachers and staff members to use masks and 39% lower in schools that improved ventilation. Ventilation strategies associated with lower school incidence included dilution methods alone (35% lower incidence) or in combination with filtration methods (48% lower incidence)."
In other words, the study actually found many significant interventions in schools, among which masks. Unbelievably bad reporting from Intelligencer.