The reason they are finally expecting inflation now is that they are going into policy measures on the fiscal side that actually enter the real economy, not just qe. Imo one dollar of fiscal expenditure has the power of at least $10 of qe if not actually more like an infinite multiplier in the case that qe does literally nothing.
If you are interested I. This kind of stuff search YouTube for Jeff snider or Lacy Hunt. Both of them are really fascinating to listen to and have a strong conviction that qe is totally ineffective.