My guess: the COVID related inflation was visible, made for a relatable talking point, and our modern day communication technologies made it easy to repeat that talking point over and over.
But it's still reasonable to punish those who presided over the inflation spike if you think their policy choices played a role in causing it.
So, punished people by electing people with the same policies, just with more lies. Perverse incentive is to keep the same policies, but lie more.
> and most people don't really believe prices will magically drop 30% back to where they were in 2019
You'd be surprised. Most people don't, but a most of the people who voted for him did seem to that he was going to magically drop prices.