Earlier quoted context omitted.
“The Postal Service receives NO tax dollars for operating expenses and relies on the sale of postage, products and services to fund its operations.” https://facts.usps.com/top-facts/
> ...for operating expenses Weasel words. See https://fortune.com/2015/03/27/us-postal-service/
I believe you may wish to re-read your own link. What he said is correct. What you stated is patently incorrect.
The above quote is from your own article and states that is a 3rd party estimation and not-at-all a tax donation that the American populace pays for, which is what you also stated.