That "particularly in well-ventilated spaces" is doing a lot of work. In normal times, people spend a lot of time with other people in not-very-well-ventilated

That "particularly in well-ventilated spaces" is doing a lot of work. In normal times, people spend a lot of time with other people in not-very-well-ventilated spaces - including, unfortunately, many conference-rooms, classrooms, small shops, bars/nightclubs, etc. So in all those actual places, Covid-19 is aerosol-transmissible. Also, in just the few weeks since that JAMA discussion, more actual examples of Covid-19 almost certainly transmitted by aerosols have been compiled; see for instance study/stories linked at: https://twitter.com/EricTopol/status/1293276767042416640 https://twitter.com/EricTopol/status/1293276767042416640