I think OP might be confusing "airborne" with "aerosolized" because the latter is transmitted through the air, just over very short distances. Although, in the case of aerosolized fecal transmission due to buildings with decrepit/faulty plumbing, the distances can be fairly large. And it does appear Covid-19 can be spread that way:

https://www.newsweek.com/coronavirus-may-spreading-so-fast-b...

https://www.tandfonline.com/doi/full/10.1080/22221751.2020.1...

https://www.vox.com/2020/2/20/21143785/coronavirus-covid-19-...

https://www.bloomberg.com/news/articles/2020-02-20/fecal-tra...