Yes, please see the discussion in the second study. They cite the findings of an investigative team of the WHO for the infections in the same building, and add

Yes, please see the discussion in the second study. They cite the findings of an investigative team of the WHO for the infections in the same building, and add their own findings to explain infections other buildings (which the WHO didn't explain). And yes, both the WHO and the study states open windows as inlets for the aerosols. In my opinion, this also explains the measures in China: here a whole building is evacuated and quarantined if one single person in the building is tested positive.