It really, really couldn't.
The highest # of of all light vehicles of all types (cars and light trucks)- sold in the US in any year, ever, was about 17.5 million (and that was 2016, it's been a little lower ever since even ignoring the covid years)
There won't be even half the # of total vehicles sold in 2032 as you suggest (and it's unclear if they'll be 100% EVs by then either as slowly as others are scaling, though surely a majority till be)- and with total # of vehicle sales generally declining as fewer people drive (a trend already ongoing, and would be greatly accelerated should robotaxis ever become at all common) on top of people are keeping cars longer ,it's possible it won't even be 1/3rd your suggested number in total US light vehicle sales for the year.
All that said- I agree with the general point the IRA is unlikely to run as long as the original passed law suggests, nor to be as cheap as the original markup estimates suggest... cost will likely be hilariously more as EVs share of the total market scales... but at this point an extra couple hundred billion against a debt already north of 30 trillion with a T and expected to be north of -45 trillion with a T- by 20232 is, well, more than a rounding error, but not THAT much more.