The book Routledge Handbook of International Criminology (edited by Cindy J. Smith, Sheldon X. Zhang, Rosemary Barberet) says about Tibetan Youth Congress:
the organization is currently considered a terrorist organization by the Chinese government.
Where did they get this information?
The closest I could find is this list of 4 organizations, hosted on
china-embassy.org, but it does not list TYC.