Warren also seemed to strongly hint (quoted below) that Treasury should be getting more of its revenue from corporate income tax. Maybe your quoted part was him reinforcing that point and putting BAs money where its mouth is.

"The $32 trillion of revenue was garnered by the Treasury through individual income taxes (48%), social security and related receipts (34 1⁄2%), corporate income tax payments (8 1⁄2%) and a wide variety of lesser levies. Berkshire’s contribution via the corporate income tax was $32 billion during the decade, almost exactly a tenth of 1% of all money that the Treasury collected. 8

And that means – brace yourself – had there been roughly 1,000 taxpayers in the U.S. matching Berkshire’s payments, no other businesses nor any of the country’s 131 million households would have needed to pay any taxes to the federal government. Not a dime."