Inflation is built into the fiat economy.
The fact that countries have an inbuilt inflation target should be enough to prove that.
To think that inflation is just transitory is absolutely ridiculous. You might as well be saying to yourself that fiat is going to last forever even though all the fiat currencies that we have ever seen in history have gone down in flames irrespective of their country of origin.
Everyone knows that inflation is a regular part of monetary policy, by design, in fiat economies. What people mean by temporary inflation in the current context is whether or not the elevated inflation we're currently experiencing is temporary or a new normal. 5% is much higher than we've experienced in a long time, 1990 in fact was the last time the annual inflation rate for the year was over 5% and it was only above 5% for that one year. Prior to that was the high inflation environment that ran from 1973 to 1982, and sometimes saw inflation rate reach 10% in those years. The economy is so vastly different now it may not even be a meaningful comparison, but that's how long it's been not a concern.