@David7850 @Emiel1 @Sarah977
Wait a minute, was the sum total of the misbehavior including the question "Can I give you my (Hidden by Airbnb) numb (Phone number hidden by Airbnb)" in the booking request?
All this means is that they wrote someting that included some numbers, which may or may not really have been phone numbers, which Airbnb automatically blocked with "Phone number hidden by Airbnb". Since it was a request to book, it seems unlikely that they were attempting to book off-platform, unless they really don't understand how Airbnb works.
I've had something like this happen a few times. It has always just meant that the guest had some innocent questions and didn't know that phone numbers can't be exchanged until after booking.
I would have given this person the benefit of the doubt, if there was nothing more to it than you're reported here so far.