I think that you are being overly critical of this article. There is no question that only BDS and a related cut in US military aid will have any potential to bring Israel to the table to ensure consideration of this or any other concept. However that is not the authors’ point.
It is widely acknowledged that the two-state solution is dead and many believe that it will be very tough to get Israelis and some Palestinians to accept a one-state solution when what they really want is more cultural, religious and political autonomy. People who do not accept either option are less likely to work for a fair solution and to support BDS.
As someone active in efforts to persuade Americans to support BDS and change Congressional support for Israel I think that having a potentially viable solution to promote can help motivate people to support BDS. It is easier to fight against goliath when you see a reasonable path forward.