Most industrialized societies already have birth rates well below replacement level.

What if several men choose not to impregnate any women?

Woops there goes your one-liner dismissal of an entire concept?

How so? If you have 10 men and 10 women, and 8 of the men kill themselves, the remaining two can still fight over all 10 women.

How does this tie into post-scarcity?

> what is population control

The more usual idea with population control is that one married couple will have multiple children. If they have more than 2.1 on average then the population will expand.

This particular comment seemed to focus on the man impregnating more than one woman, while saying nothing about the total number of children born per capita.

I thought they might have been talking about access to mates as a scarce resource, but to be honest that's just a wild guess as it's not clear to me what they intended.