So what happened to the entire night elf immortality thing

[Combatbutler]

Long lived is not immortality. A few thousand years is nothing against eternity.

Blizzards choice of words not mine.

[Terongor]

Did Blizzard forget about it or? At the end of Reign of Chaos after they defeated Archimonde and malfurion just like «The victory came at a great cost, we lost our immortality» soooo why havent anyone died of old age yet then? Shouldnt like Illidan, Malfurion and Tyrande have died since they are more than 10K years old?

Wolfheart book talked how night elves have started dying of old age and illneses.