It's a computer algorithm and it means nothing.
I'm a single woman and only rent my spare room out to women.... so I often decline reservations from men. Yes, the first thing my listing says is; i only rent to women......men still try to book. I also decline people who don't reply to my questions, or who won't post a photograph and information. It is their fault that I get this message from Airbnb.
So I try to ignore it, but it really riles me that is always a 'could do better' item on my listing that is not my fault.. They have clearly not bothered to read my messages to these people.