That can be caused by supply-side inflation, eg., a sudden general drop in supply. Or demand-side, a sudden general increase in available cash.
Central banks increasing money supply is demand-side inflation. The issue with this, as a "final theory", is the last decade+ where it didnt hold; and in japan where inflation and money supply are entirely uncorrelated.
The only difference today, with inflation, is the supply-side shock. If central bank policies were causing inflation, they'dve caused it over the last decade; and likewise in japan.
Whilst central bank policies have raised asset prices, etc. there's very limited evidence they've raised, eg., the CPI