This is THE central purpose and movement behind the elite. The whole enchilada and the special sauce is the belief that we [they] are about to "cure" aging one way or another.

They fully and completely believe that they will not die, they will gain power forever, and this is how they plan to "win" the war against heaven. The only thing they fear is death.

Depopulation is because the second thing they fear is a planet full of breeding immortals.