It's a good article and, as a father, I experience and certify what it says. It presents the causes of the main observed fact (more time for kids) which happens anywhere in the Western world at least. But it can't go further and explain what general social changes cause all that. For me, in no order, they are:

Financial strains (family disposable income, high cost of living, wealth inequality)

Expand of electronic device use (from TVs to modern ones) and their apps

Convergence of gender roles, making males less masculine

General loss of classical values, promotion of easy life, short term goals and superficial qualities leading to misery and deactivation