I understand his argument but I think it's a biased view, we assume modern leisure is better but I'm not sold on this.

We are only beginning to find out what happens when women have full independence and children are not a necessary byproduct of sex, and it seems like cratering birthrates are at least one result.

A lot of the costs of birthing and raising children were paid solely by women, but benefited the whole tribe. Now that those costs can be made explicit, I wonder how tribes will chose to compensate women such that they are sufficiently incentivized to have at least replacement level of kids.