Probably because this "landmark" bill is more likely to create higher inflation:
https://www.nbcnews.com/think/opinion/inflation-bill-sinema-manchin-senate-horribly-misnamed-rcna41712
But the Inflation Reduction Act isn’t just misnamed because it won’t do what its title promises — it will likely make inflation worse by raising the cost of producing goods and services and lowering their overall supply. The higher cost and consequent lower supply of goods means that money circulating in the economy is used to purchase fewer goods, thereby pushing up the price of goods, leading to higher inflation.