"coercion" in article 18, paragraph 21, is to be broadly interpreted and includes pressure applied by a State or policies aiming at facilitating religious conversions. "
Coercion is much more then physical threats, waterboarding, or water torture. It is to be broadly interpreted. I know in other contexts, coercion is much broader then physical harm. It includes blackmail, threats of losing job, illusor promises, etc. In Wollersheim v. Scientology the California court touched on coercion as the threat of the church turning one's family against them, loss of business customers, and high amounts due to the church upon leaving. Coercion is a threat or policy of a church that affects this life, as opposed to hellfire which affects the afterlife.
As far as death - think of the blood issue. A fading JW has the blood issue present itself. He wants to leave the religion, but is stuck. He really wants a blood transfusion, but has to think that it's going to mean he's shunned by his family, friends, and business associates. He has to choose between a medical, life saving measure, or keeping his family/friends/business in tact. He makes the decision to forego blood. He takes his chances. He is coerced.