True aerosols are unlikely to be produced outside of medical procedures. Droplet emission appears to be, as the post points out, the chief culprit. Talking, singing, exertion, etc all promote much more droplet emission than simply breathing. People may go back to the office but face to face discussions are going to be one of the things that are strictly limited. Some companies might almost entirely ban them.
This of course also speaks to the likely effectiveness of masks as source control. Cutting the viral output of a given person makes it less likely another will be infected, even if the reduction is merely partial.