Well, any Federal funds are categorically not tax payer funds. The Federal government spends money into existence as it is a currency issuer (through the Federal Reserve).
US Federal Taxes go to the Treasury[1][2], which then spends it on Federal government programs. If spending is more than receipts, the US Federal Reserve issues securities (ie, sells bonds) to raise money[3].
Quantitative Easing by the Federal Reserve does cause money to "appear", but this is different to the general process for funding federal government programs[4] (Note that the money can disappear if/when the Reserve chooses to resell those assets).
[1] https://fiscaldata.treasury.gov/datasets/monthly-treasury-st...
[2] https://www.reuters.com/article/us-usa-trump-taxes-revenue-e... ("Of the $3.46 trillion in receipts taken in by the U.S. Treasury during fiscal 2019")
[3] https://www.stlouisfed.org/open-vault/2019/november/where-fe...
[4] https://www.forbes.com/advisor/investing/quantitative-easing...
The shortfall between Federal government spending and tax receipts is the deficit. The government has to borrow that money, which it does by having the Treasury issue debt securities.
Not sure where these claims come from either.