Guess you have already been in contact with Airbnb, would be interested to know how they handle this!
i had a potential guest who sent just an ”enquiry”, and after a few messages seemed to think he had a booking and said he would check in the next day. And he had not even been ”invited to book” yet! I made it clear in a message he did not have a confirmed booking yet and could not just turn up, but never heard back and was nervous the whole next day, that he WOULD turn up. Don’t know if he had just misunderstood how things work on Airbnb, or if he was trying to trick me into letting him stay without booking and paying.
Hope you get help from Airbnb and that things work out OK!