If you stepped through a time-travel portal, your conscience would effectively not exist between the original time and the time the portal leads to, yet no one would call you dead. If you could somehow install your mind into a new body, let’s say you download it into a flashdrive and plug it into someone else’s brain while your original body lays without a mind, people may call our body dead but not you. So when there is a continuity of self between the person who steps inot the teleporter and the person who steps out, I will never call that a death, that’s silly.