Lousy research by the author you cite.
Arlington is not a suffragan diocese to Washington, where Cardinal McCarrick was archbishop. (McCarrick definitely *is* one of the bad guys.) Despite teh Archdiocese of Washington being directly between Arlington and Baltimore, Arlington belongs to the Archdiocese of Baltimore. When the Washington Archdiocese was created, it was carved out of the Baltimroe Metropolitan, and the Virginia dioceses remained with Baltimore.