I have never understood why Airbnb even permits bookings to proceed that clearly are not in accord with house rules. If something is in house rules, then it's not that hard to create an algorithm - children - ditto for pets, smoking, vaccination status, or whatever.
We turned off instant booking near the start of the Pandemic because we wanted to make sure that guests were vaccinated - never had a single push back from asking. The biggest issue is, and always has been, guests with children who are 'no trouble'. Even then, we still get push back when we decline a booking because the enquirer is convinced that we shouldn't make rules about our own place.
Airbnb could easily fix this - they don't though.