Being nominated doesn't mean you are nominated by the Nobel Committee itself, by the way.;
Process of Nomination and Selection
The Norwegian Nobel Committee is responsible for selecting the Nobel Peace Prize Laureates. A nomination for the Nobel Peace Prize may be submitted by any persons who are qualified to nominate.
Qualified Nominators
According to the statutes of the Nobel Foundation, a nomination is considered valid if it is submitted by a person who falls within one of the following categories:
• Members of national assemblies and governments of states
• Members of international courts
• University rectors; professors of social sciences, history, philosophy, law and theology; directors of peace research institutes and foreign policy institutes
• Persons who have been awarded the Nobel Peace Prize
• Board members of organizations that have been awarded the Nobel Peace Prize
• Active and former members of the Norwegian Nobel Committee; (proposals by members of the Committee to be submitted no later than at the first meeting of the Committee after February 1)
• Former advisers to the Norwegian Nobel Committee
The Nobel Committee also doesn't release info on who has been nominated.
The only way this happens is either through guesswork, or someone who nominated a person releases the information.
So yes, this is a PR stunt.