Ok then consider that Airbnb can simply change the reservation info (not that they should or would in most cases) and then the lock software will grant access. Regardless Airbnb has access to grant access to their guest. It is a security issue, albeit very small.
Most (probably 99.94% (pure! )) would not even worry about it but given my experiences with Airbnb I consider it a risk. I removed their access over a year ago (maybe 2, I can’t remember now) by deactivating the integration because if it. I just want to let people know to be aware that it is POSSIBLE, although highly unlikely.