The current science doesn't say that Covid isn't transmitted by touching surfaces. It says the possibility of transmission by surfaces is low compared to airborne transmission. And that is because there would have to be a specific set of circumstances for surface transmission. First, the surface would have to have active virus droplets on it, there would have to be enough viral load to infect anyone else, and the person who touched it next would have to then touch their mouth, nose or eyes or spread it onto other surfaces before thoroughly washing their hands.
So there would be much less likelihood of transferring the virus from a surface in your home that someone who was infected had merely breathed on, than there would be from touching a railing on a public bus that hundreds of people had touched, for instance, or from someone who was infected shouting in your face, but that doesn't mean it would be impossible to contract COVID from a surface.
At least according to what is presently known, but new findings about this virus come out daily.
However, I do think much of Airbnb's cleaning protocol is over the top and pointless, like putting on gloves to carry clean linens, when washing your hands with soap first would be just as safe.
@Anne9699