Israel is paying for those weapons. It’s clearly stated in the article.
“On the same day, the State Department announced over $20 billion in new arms sales to Israel, including fighter jets, armored vehicles, and ammunition.”
L
The article also says:
The president is reversing a ban on selling offensive weapons to Saudi Arabia and advancing taxpayer-funded military aid to Israel...
Earlier this year, Congress passed a $14 billion aid package for Israel. It included funds to replenish weapons that had been sent to Israel from U.S. military warehouses and direct financial grants to the Israeli government. On Friday, the Biden administration released $3.5 billion in those grants.