That's dumb. It doesn't happen in the same timeline. Everytime he killed himself, the rest of the world just goes on. So we're talking about 4901 worlds here, of which in 4090, he's dead. But those worlds don't end.
If it's a time loop in the same line, he would become a paradox since he only got the skill because of the Flame Emperor, and now the Flame Emperor doesn't exist, he never got it in the first place.