You don't stop giving the same answers all the time. As Clover mentioned, this doesn't only work when he dies. Zeref didn't know that his body would disappear, but he knew that he would rewind time.Because this is his ability, that's why he calmly waited for his first attack against Natsu because he rewinded time. And although I have explained it 5-6 times before, Zeref will be aware of genjutsu thanks to analytical prediction, information analysis and SBA rules, so he can use it offensively, it is quite simple.We also base it on profiles. And in the profile it is stated that this is passive. If you are very insistent, open a CRT and remove it.
Zeref already gets the analytical prediction thanks to Mavis
You'd better go and take a look.