The USA has been in “unrestrained borrowing” because it’s been funding itself with continuing resolutions rather than a budget since 2009. That means that the extra trillion dollars in 2009 “temporary” stimulus has been added to the debt every year since on top of the prior trajectory. This is easily seen if you look at the relevant graphs on FRED.

That said, government borrowing or money creation doesn’t directly cause inflation either. Sad to say, the inflation we’re seeing appears to be as much on the production and importing side as it is on the demand side.

Where are the modern monetary theorists when you need them?

They seem to have all disappeared lately. Used to see them as pundits on news shows daily (or in replies to my comments here) and now they are just gone suddenly.

It was legitimately the belief of the ruling class in the US that printing money isn't inflationary. You would be laughed out of the room to suggest the fact. I was.