There was a huge increase in the money supply during COVID. This was bound to impact inflation, as it has. Corporations can’t just raise prices unless there is money to chase it. And there was. Here’s the chart:
https://fred.stlouisfed.org/series/M2SL
Biden and the Democratic leadership aren’t solely responsible for this, but they aren’t blame-free either.
Krugman’s track record doesn’t inspire confidence in the accuracy of his opinion. A year ago he admitted he was wrong about inflation.