Where did you hear that rumor?
There is a difference betwen airborne and aerosol that most medical lay people do not understand.
Airborne signifies that the virus it drifts in the wind - it does not !
Aerosol indicates that the virus, contained in moisture dropletts, or even smaller mico-dropletts, can spread the virus and contaminate others, or create fomites.
Vitality of aerosols vary according to moisture, exposure to U/V rays , and temperature.
Dropletts occur within 3 feet since they are heavy with moisture, micro-dropletts can extend out to 15-18 feet.
Dropletts example :sweat, cough, diarrhea discharge, sneezing (bodily fluids- 3 feet dispersion)
Micro-dropletts example: cough, diarrhea ,projectile vomiting,flushing toilet (bodily fluids 15 -18 feet dispesion ) and subject to wind dispersion.