This seems to me like Ideology disguised as Tautology.
"Saving = Investment" is an accounting identity and not a causal law.
He shifts by implying that 'saving' drives 'investment'. In accounting even unsold inventories are forced into the 'investment' bucket.
No wonder he returned: he can focus on meaningful work without direct financial pressure, with full access to people, decisions, and resources.
If only we all had a time in life to do what we love, get paid, and face no paywalls. I call that "liberated work". If only at least retirement was like that.
free doesn't imply that the service/product has no costs, only that your transaction has no costs. Google is also free but it has costs (mostly paid by ads which are then included in products costs).