So you are saying inflation should be expected because unemployment is low right now?
Nope, I'm saying that for some bizarre reason, the western world is irrationally fixated on keeping inflation within a specific range (sure, we don't want hyperinflation, but that never happens unless there is a seriously chronic shortage of life essentials such as food), and part of that fixation was the introduction of the NAIRU in the mid 70's, thus keeping unemployment at a level of around 5% as a matter of policy (whilst whipping and punishing the unemployed as if just for sport), and thus it doesn't matter where the economy tries to take itself, the policy of inflation control via interest rates ensures that the economy for the last 45 or 50 years has remained on average, permanently mired in mediocrity, with stagnating wages, growing debt, and other fun ways of keeping the people repressed.
How that relates to right now, is that there has been a jump in inflation caused by the war (and sure, government stimulus helps too), and thus, due to this policy of mediocrity, we now have interest rates jumping upwards in order to kill the economy.
On Biden, his mistake is merely thinking that as president, he actually has any economic control. Oh no no no, that control is 100% in the hands of those that control the interest rate lever. The president can pump stimulus in all he wants, but the interest rates will be shoved upwards in order to kill the effects of that stimulus.
However, remove the NAURU, and remove the fixation with keeping inflation within a tiny fixed window, and the stimulus would actually succeed in booming the economy, and lead to a new period of prosperity, growth, invention, low unemployment, and productivity. Some might even be bold enough to state that it would be a time where America became great again (America, of course, was most recently great between WWII and the introduction of NAURU, a period when unemployment averaged around 1-2%, and nope, we didn't see hyperinflation, and nor did we see the interest rates being jammed upwards to control inflation by killing the economy). Imagine how great America could have been if we hadn't seen 50 years of NAURU? And the policy still persists.