This is the correct part of your post. Spread from touching infected surfaces is thought to be a minor route of transmission.
"sustained drift over longer distances" is not a prerequisite for transmission to be airborne. You have misunderstood the use of the term.
I'm literally quoting WHO and literally citing them about how the disease does and does not spread with respect to significance of transmission (significant: droplets over short distances, fomites (infected surfaces); possible but insignificant: airborne, fecal-oral, asymptomatic regardless of route). If you have an issue with this, please take it up with WHO, not me.
https://www.who.int/docs/default-so...na-joint-mission-on-covid-19-final-report.pdf