Good summary. I'd like to clarify that the source of the original confusion was the 100 micron threshold for falling out of the air being conflated with the 5 micron threshold of tuberculosis infection decades ago. So the WHO believed SARS-CoV-2 droplets would fall onto surfaces because they were larger than 5 microns, but in actual fact they would remain suspended in the air. That's why preventative mask advice only became well-known several months into the pandemic.
Good summary. I'd like to clarify that the source of the original confusion was the 100 micron threshold for falling out of the air being conflated with the 5 micron threshold of tuberculosis infection decades ago. So the WHO believed SARS-CoV-2 droplets would fall onto surfaces because they were larger than 5 microns, but in actual fact they would remain suspended in the air. That's why preventative mask advice only became well-known several months into the pandemic.