From a mathematical perspective that makes sense. However a KD ratio is how many kills per life. So if it was 5 kills to 1 death, won't the KD be 2.5 because each life has equivalent of 2.5 kills
I think in the military movies and stuff (won’t pretend I know actually military shit) that’s why we hear the term confirmed kills, and k/d is mostly heard in video games and discord bragging threads. After all from a score perspective, the person who has killed 10 people and not died should be at a higher score ranking than the guy who killed 10 people then died and had to respawn.