When someone dies, isn't that having their life cut short? What does Jack mean by that statement?

"Yes."

To all of those statements. But maybe it would help Jack to form an answer if he knew why he was asking this question.

"I was the last leader, responsible for everyone left. Then my original world was destroyed." Deleted. His hand on Jack's fur stills. "Hundreds, thousands of people, gone. There are no bodies."