Libel requires falsity.  There is nothing false in saying that a person legally named Bradley Manning wishes to be known as Chelsea Manning.  Nor is there falsity in stating that that person was legally named Bradley Manning at the time of all pertinent events.  Do you have any evidence beyond hand-waving that libel would attach to such claims? Also, would your argument apply if Manning's name had formerly been Pat and she now wished to be known as Jess?  Would it be OK to refer to Manninghistoricallyas Pat?     *