Did the listing say there were security cameras? I have security cameras and it's listed as such, so if they are on the listing (and if airbnb deleted your comment knowing you mention cameras, I'm going to assume they were given that it's a policy violation not to have them listed), I don't know if you can call it spying. That said, if the host 'made up' claims based on the footage, did you ask for a copy of the footage? You're entitled to it where the claim is concerned, but at the end of the day, security cameras on the property isn't spying, it's simply a safety measure.