According to that link he wasn't able to get it invalidated. (not a lawyer, baseless speculation follows) There is proof that that guy did it first though, so i

According to that link he wasn't able to get it invalidated. (not a lawyer, baseless speculation follows) There is proof that that guy did it first though, so if you get permission from him and then get sued by W3W then maybe you can claim prior art that way(?)