The measles virus is much better studied and it behaves like the aerosol described. It's contagious to the point where any sort of contact in an enclosed space

The measles virus is much better studied and it behaves like the aerosol described. It's contagious to the point where any sort of contact in an enclosed space is practically guaranteed to infect anyone who isn't immunized from a vaccine or previous exposure (and sometimes even then). Based on the numbers South Korea has put out for numbers of infected vs tested and the extensive contact tracing they've done, it doesn't seem that this virus quite reaches that level of infectiousness. I think there's more to the story, like HCoV-19 may have a half life long enough for experiments to detect on surfaces and in an aerosol, but short enough that it doesn't present enough of a viral load to infect anyone relatively quickly.