These "studies" are stupid. Airflow is the [likely only] thing that matters. Social distancing in a 0 airflow environment isn't going to work, as droplets stay suspended. Masks prevent large droplet spread, but aren't fully effective (which is well known).

What is effective is physics. It's impossible for a droplets to spread upwind, and often downwind as well, since they don't hang around in suspension.

Get airflow certifications/requirements updated would not only help small businesses recover quicker but also pay dividends during normal flu season, let alone a pandemic.