@Stephanie,
Thanks for sharing. IMO, the policy to temporarily close a shared listing is contrary to current industry and public health standards. Many countries have done away with public masking requirements. In the US, Dr. Fauci, the chief infection disease expert, has officially proclaimed the country is out of the pandemic phase, and the European Commission has said that the EU has moved away from the emergency phase of the pandemic.
Businesses such as hotels, restaurants and cruises, are no longer shutting down or restricting operations due to customers/guests/staff getting the virus. A guest or host who goes outside and performs normal errands and activities has comparable opportunity to catch and spread the virus as they would inside of the home share.
Please correct me if I am wrong, but I don't believe that Airbnb has a policy of closing a rental if a guest reports that they have another respiratory illnesses, like the flu or pneumonia. Those conditions are considered medically manageable, and now in many parts of the world, so is COVID.