I disagree with his point, but to be fair, I think he is envisioning the communist utopia, where everyone has equal access to everything and there is no inequality of ownership. So the baby would have exactly as much as the billionaire (making them no longer a billionaire).

If we had a mandated wage that everyone got, regardless of job, that would mean a flat tax makes sense, in his defense.

Do I think a society where everyone gets paid the same regardless of job would actually function though? No.