It is not the total amount of inherited wealth that is a problem (indeed that is just a measure of the total wealth available for intergenerational transfer – which is basically all privately held wealth). And I think at various points this article fails to give more than lip service to the question of disproportionately large inheritances.
Of course, taxing large numbers of modest inheritances does not achieve redistribution unless the revenue is actually redistributed (eg by something like a UBI). But taxing inheritances (and gifts) at the same progressive rate as earned income could provide for some kind of Universal Fair Inheritance – which would leave the assets in private hands (eg for reinvestment etc), but just on a more equitable basis. And the problem of extracting taxes from illiquid assets of uncertain value like a functioning business could be solved by accepting an ownership share of the asset as an alternative to demanding payment in cash.
Source: Inherited wealth is a natural byproduct of a healthy, growing economy | Aeon Essays