At literally every point of modern history, a reduction in the amount of humans was beneficial for the vast amount of humans in the long run.
Like, even the Black Death led to reduced wealth inequality and the beginnings of workers rights.
I don’t see how someone can claim that the mass death of people is simultaneously beneficial to that people.
There’s a difference in reduction of humans by events that cause death at large scale vs decline in rates of reproduction. Clearly catostrophic death is being used as an example of “a reduction in the amount of humans.”