The arguments are interesting and not so usual, so always interesting to nourish reflexion, thanks (I was personally familiar with them).
A world with a large and growing population is a dynamic world that can create and sustain progress.
The right conclusion though is “this is a very complicated subject, we have no idea if it’s better or worse to have more or less people”.
This paper felt significant and promising, but 8 years later, there seem to be no real follow-up. Do we know why? Am I missing something?