Earlier quoted context omitted.
There has long been a desire to privatize the USPS, so this also fits neatly into the narrative that the USPS should not be a public good.
A public good is a good that is both non-rivalrous and non-excludable. Establishing a federal monopoly doesn’t turn the product of that monopoly into a public good. Likewise, a public good can be provided by a non-government entity.
Jokes aside, I getting hung up on that term in this context feels unnecessary, it was quiet clear what kaitai was talking about from the text he wrote.