If the person is the pair and the pair no longer exists, the person no longer exists.

如果人是这一对儿,而这对儿已经不复存在,那这人也就不存在了

耶鲁公开课 - 死亡课程节选

And then perhaps the right thing to say is the person no longer exists, so they no longer exist as a person, even if the body is still alive.

也许正确的说法应该是,这个人已经不存在了，他们作为人的身份已经消失，即便肉体还是活着的。

耶鲁公开课 - 死亡课程节选